Havengul Lich + Rooftop Storm + Phyrexian Altar
Havengul Lich
Rooftop Storm
Phyrexian Altar
Requires
Havengul Lich must be on the battlefield.
Rooftop Storm must be on the battlefield.
Phyrexian Altar must be on the battlefield.
Mana needed: 
Steps
- Activate Havengul Lich by paying , allowing you to cast the Zombie card from your graveyard this turn.
- Cast the Zombie from your graveyard by paying
due to Rooftop Storm. - Activate Phyrexian Altar by sacrificing the Zombie cast in step 2, adding .
- Repeat.
Results
Infinite LTB. Infinite ETB. Infinite sacrifice triggers. Infinite death triggers. Infinite storm count.
Wilhelt, the Rotcleaver
7.53% of 18986 decks
1430 decks
The Scarab God
5.67% of 10527 decks
597 decks
Varina, Lich Queen
5.99% of 7141 decks
428 decks
Gisa and Geralf
6.36% of 4799 decks
305 decks
Grimgrin, Corpse-Born
10.02% of 2135 decks
214 decks
Thraximundar
3.48% of 1955 decks
68 decks
Sidisi, Brood Tyrant
0.91% of 6406 decks
58 decks
Nevinyrral, Urborg Tyrant
3.49% of 1549 decks
54 decks
Muldrotha, the Gravetide
0.23% of 15793 decks
36 decks
Kraum, Ludevic's Opus // Tormod, the Desecrator
8.21% of 280 decks
23 decks
Narfi, Betrayer King
2.54% of 865 decks
22 decks
Nekusar, the Mindrazer
0.06% of 18855 decks
11 decks
Lord of Tresserhorn
1.22% of 735 decks
9 decks
Morophon, the Boundless
0.08% of 9963 decks
8 decks
Vela the Night-Clad
0.73% of 682 decks
5 decks
Oloro, Ageless Ascetic
0.04% of 12431 decks
5 decks
Sefris of the Hidden Ways
0.05% of 8773 decks
4 decks
Sedris, the Traitor King
0.21% of 1873 decks
4 decks
New Cards
Zul Ashur, Lich Lord
88% of 219 decks
+85% synergy
Hungry Ghoul
80% of 5 decks
+75% synergy
Blasphemous Edict
75% of 71 decks
+41% synergy
Abyssal Harvester
56% of 9 decks
+40% synergy
Unstoppable Slasher
49% of 376 decks
+43% synergy
High Synergy Cards
Gravecrawler
96% of 3344 decks
+93% synergy
Diregraf Captain
91% of 3344 decks
+87% synergy
Wayward Servant
86% of 515 decks
+85% synergy
Diregraf Colossus
84% of 3341 decks
+82% synergy
Necroduality
81% of 3254 decks
+79% synergy
Death Baron
79% of 3344 decks
+77% synergy
Undead Warchief
74% of 3344 decks
+72% synergy
Undead Augur
72% of 3328 decks
+70% synergy
Gray Merchant of Asphodel
78% of 3343 decks
+69% synergy
Headless Rider
69% of 3254 decks
+68% synergy
Top Cards
Corpse Knight
70% of 511 decks
+65% synergy
God-Eternal Oketra
67% of 512 decks
+65% synergy
Wight of the Reliquary
63% of 30 decks
+55% synergy
Carrion Feeder
63% of 3344 decks
+58% synergy
Ratadrabik of Urborg
61% of 444 decks
+58% synergy
Cryptbreaker
61% of 3341 decks
+59% synergy
Mikaeus, the Unhallowed
60% of 3344 decks
+57% synergy
Underrealm Lich
58% of 118 decks
+55% synergy
Lord of the Accursed
58% of 3340 decks
+57% synergy
Cemetery Reaper
58% of 3344 decks
+56% synergy
Creatures
Warren Soultrader
57% of 906 decks
+50% synergy
Lord of the Undead
57% of 3344 decks
+56% synergy
Plague Belcher
56% of 3340 decks
+55% synergy
Relentless Dead
54% of 3341 decks
+54% synergy
Accursed Marauder
54% of 776 decks
+45% synergy
Cleaver Skaab
52% of 3295 decks
+51% synergy
Noxious Ghoul
50% of 3344 decks
+50% synergy
Champion of the Perished
50% of 3295 decks
+49% synergy
Sidisi, Undead Vizier
49% of 3341 decks
+47% synergy
Hordewing Skaab
49% of 3295 decks
+48% synergy
Gisa and Geralf
45% of 3341 decks
+43% synergy
Wilhelt, the Rotcleaver
45% of 3295 decks
+44% synergy
The Scarab God
45% of 3340 decks
+43% synergy
Fleshbag Marauder
45% of 3344 decks
+41% synergy
Midnight Reaper
44% of 3333 decks
+41% synergy
Vengeful Dead
44% of 3344 decks
+43% synergy
Zombie Master
43% of 3344 decks
+42% synergy
Glissa Sunslayer
38% of 91 decks
+33% synergy
Grimgrin, Corpse-Born
36% of 3344 decks
+35% synergy
Gleaming Overseer
35% of 3330 decks
+32% synergy
Ghoulcaller Gisa
32% of 3341 decks
+30% synergy
Grave Titan
31% of 3344 decks
+28% synergy
Tomb Tyrant
30% of 3295 decks
+29% synergy
Poppet Stitcher
29% of 3295 decks
+29% synergy
Geralf, Visionary Stitcher
29% of 3254 decks
+28% synergy
Eternal Witness
28% of 118 decks
+7% synergy
Roaming Throne
28% of 1386 decks
+18% synergy
Geralf, the Fleshwright
26% of 1027 decks
+25% synergy
Overcharged Amalgam
26% of 3254 decks
+25% synergy
Mondrak, Glory Dominus
26% of 351 decks
+16% synergy
Acererak the Archlich
25% of 3296 decks
+25% synergy
Murderous Rider
25% of 3321 decks
+23% synergy
Deathbringer Thoctar
25% of 142 decks
+24% synergy
Archghoul of Thraben
25% of 3254 decks
+24% synergy
Sakura-Tribe Elder
25% of 118 decks
+6% synergy
Grim Servant
23% of 921 decks
+22% synergy
Undead Sprinter
23% of 13 decks
+22% synergy
Jodah, Archmage Eternal
23% of 13 decks
+19% synergy
Binding Mummy
23% of 515 decks
+23% synergy
Gisa, the Hellraiser
22% of 1062 decks
+21% synergy
Shepherd of Rot
22% of 3344 decks
+21% synergy
Muldrotha, the Gravetide
22% of 118 decks
+16% synergy
Graveborn Muse
21% of 3344 decks
+21% synergy
Mahadi, Emporium Master
21% of 117 decks
+14% synergy
Lich Lord of Unx
20% of 3344 decks
+20% synergy
Jarad, Golgari Lich Lord
20% of 118 decks
+17% synergy
Aftermath Analyst
20% of 41 decks
+15% synergy
Ravenous Rotbelly
19% of 3295 decks
+19% synergy
Tato Farmer
18% of 39 decks
+16% synergy
Mayhem Devil
17% of 139 decks
+7% synergy
Instants
Swords to Plowshares
56% of 515 decks
-7% synergy
Counterspell
51% of 3344 decks
+8% synergy
Anguished Unmaking
41% of 515 decks
+17% synergy
Entomb
38% of 3344 decks
+30% synergy
Cyclonic Rift
38% of 3344 decks
+10% synergy
Withering Torment
36% of 306 decks
+17% synergy
Void Rend
36% of 487 decks
+21% synergy
Assassin's Trophy
35% of 118 decks
+4% synergy
Path to Exile
34% of 515 decks
-12% synergy
Dark Ritual
33% of 3344 decks
+11% synergy
Vampiric Tutor
28% of 3344 decks
+10% synergy
Terminate
25% of 142 decks
+5% synergy
Chaos Warp
25% of 142 decks
-7% synergy
Beast Within
25% of 118 decks
-14% synergy
Lazotep Plating
23% of 3330 decks
+22% synergy
An Offer You Can't Refuse
23% of 2901 decks
+1% synergy
Teferi's Protection
21% of 515 decks
+1% synergy
Mana Drain
19% of 3344 decks
+4% synergy
Fierce Guardianship
19% of 3314 decks
+1% synergy
Negate
19% of 3344 decks
-4% synergy
Go for the Throat
19% of 3344 decks
+12% synergy
Dovin's Veto
19% of 512 decks
-0% synergy
Rise of the Dread Marn
17% of 3301 decks
+16% synergy
Grisly Salvage
17% of 118 decks
+12% synergy
Arcane Denial
17% of 3344 decks
-3% synergy
Deflecting Swat
16% of 136 decks
-0% synergy
Deadly Rollick
16% of 3314 decks
+5% synergy
Despark
16% of 512 decks
+0% synergy
Putrefy
15% of 118 decks
-1% synergy
Generous Gift
15% of 511 decks
-10% synergy
Deadly Plot
15% of 2260 decks
+14% synergy
Heroic Intervention
14% of 118 decks
-15% synergy
Swan Song
14% of 3343 decks
-2% synergy
Fell the Profane
14% of 906 decks
+3% synergy
Enlightened Tutor
14% of 515 decks
-4% synergy
Village Rites
14% of 3312 decks
+4% synergy
Malakir Rebirth
13% of 3310 decks
+5% synergy
Crop Rotation
12% of 118 decks
+2% synergy
Bedevil
12% of 139 decks
-3% synergy
Mortify
11% of 515 decks
-1% synergy
Infernal Grasp
11% of 3295 decks
+4% synergy
Rakdos Charm
11% of 142 decks
-4% synergy
Sink into Stupor
10% of 906 decks
-3% synergy
Tragic Slip
10% of 3344 decks
+6% synergy
Fracture
9% of 504 decks
+2% synergy
Deny the Witch
9% of 396 decks
+7% synergy
And They Shall Know No Fear
9% of 396 decks
+7% synergy
Stroke of Midnight
9% of 256 decks
-4% synergy
Second Harvest
8% of 118 decks
+4% synergy
Krosan Grip
8% of 118 decks
+1% synergy
Sorceries
Zombie Apocalypse
55% of 3344 decks
+54% synergy
Feed the Swarm
45% of 3310 decks
+27% synergy
Empty the Laboratory
39% of 3295 decks
+38% synergy
Reanimate
39% of 3344 decks
+23% synergy
Demonic Tutor
37% of 3344 decks
+15% synergy
Victimize
36% of 3344 decks
+25% synergy
Army of the Damned
36% of 3344 decks
+34% synergy
Farseek
31% of 118 decks
-3% synergy
Life from the Loam
31% of 118 decks
+27% synergy
Damn
30% of 504 decks
+13% synergy
Toxic Deluge
29% of 3341 decks
+11% synergy
Cultivate
28% of 118 decks
-18% synergy
Blasphemous Act
27% of 142 decks
-6% synergy
Diabolic Intent
27% of 3344 decks
+19% synergy
Buried Alive
27% of 3344 decks
+21% synergy
Living Death
26% of 3344 decks
+21% synergy
Damnation
23% of 3344 decks
+15% synergy
Vandalblast
21% of 142 decks
+5% synergy
Nature's Lore
20% of 118 decks
-12% synergy
Distant Melody
20% of 3344 decks
+15% synergy
Three Visits
18% of 118 decks
-7% synergy
Squirming Emergence
16% of 50 decks
+13% synergy
Faithless Looting
15% of 142 decks
-1% synergy
Rise of the Witch-king
15% of 60 decks
+9% synergy
Supreme Verdict
14% of 515 decks
-0% synergy
Kodama's Reach
14% of 118 decks
-18% synergy
Rampant Growth
14% of 118 decks
-21% synergy
Rise of the Dark Realms
13% of 3343 decks
+10% synergy
Dreadbore
13% of 142 decks
+10% synergy
Kindred Dominance
12% of 3339 decks
+9% synergy
Agadeem's Awakening
12% of 3310 decks
+9% synergy
Patriarch's Bidding
12% of 3344 decks
+9% synergy
Dread Summons
12% of 3341 decks
+11% synergy
Jarad's Orders
12% of 118 decks
+10% synergy
Dark Salvation
11% of 3341 decks
+10% synergy
Dread Return
11% of 3344 decks
+6% synergy
Lich-Knights' Conquest
10% of 1591 decks
+8% synergy
Raise the Palisade
10% of 1680 decks
+7% synergy
Diabolic Tutor
10% of 3344 decks
+3% synergy
Necrotic Hex
9% of 3308 decks
+8% synergy
Vindicate
9% of 515 decks
+3% synergy
Vanquish the Horde
9% of 504 decks
+5% synergy
Grim Tutor
9% of 3344 decks
+4% synergy
Bala Ged Recovery
9% of 117 decks
-0% synergy
Lively Dirge
8% of 1027 decks
+6% synergy
Windfall
8% of 3344 decks
-5% synergy
Cruel Ultimatum
8% of 142 decks
+5% synergy
Ghoulcaller's Harvest
8% of 117 decks
+7% synergy
Ghouls' Night Out
8% of 3295 decks
+7% synergy
Splendid Reclamation
8% of 118 decks
+4% synergy
Utility Artifacts
Ashnod's Altar
56% of 3344 decks
+48% synergy
Hedge Shredder
31% of 13 decks
+25% synergy
Wand of Orcus
31% of 3296 decks
+30% synergy
Skullclamp
30% of 3344 decks
+18% synergy
Conduit of Worlds
30% of 91 decks
+23% synergy
Altar of Dementia
29% of 3344 decks
+27% synergy
Banner of Kinship
25% of 71 decks
+13% synergy
Bontu's Monument
24% of 3340 decks
+21% synergy
Fist of Suns
23% of 13 decks
+16% synergy
Unscythe, Killer of Kings
20% of 142 decks
+20% synergy
Chainsaw
17% of 18 decks
+15% synergy
Lightning Greaves
17% of 3344 decks
-9% synergy
Herald's Horn
15% of 3339 decks
+9% synergy
Bolas's Citadel
13% of 3330 decks
+4% synergy
Jet Medallion
12% of 3344 decks
+10% synergy
Vanquisher's Banner
9% of 3339 decks
+5% synergy
Wayfarer's Bauble
9% of 3344 decks
-1% synergy
Swiftfoot Boots
8% of 3344 decks
-20% synergy
Nim Deathmantle
8% of 3344 decks
+7% synergy
Grimoire of the Dead
7% of 3344 decks
+7% synergy
Whip of Erebos
7% of 3343 decks
+3% synergy
Urza's Incubator
6% of 3344 decks
+3% synergy
Pyre of Heroes
6% of 3301 decks
+6% synergy
Alhammarret's Archive
6% of 3341 decks
+4% synergy
Coat of Arms
5% of 3344 decks
+3% synergy
Enchantments
Endless Ranks of the Dead
56% of 3344 decks
+54% synergy
Anointed Procession
42% of 515 decks
+33% synergy
Rhystic Study
33% of 3344 decks
+5% synergy
Grave Pact
33% of 3344 decks
+28% synergy
Smothering Tithe
28% of 513 decks
+4% synergy
Kindred Discovery
28% of 3339 decks
+20% synergy
The Meathook Massacre
25% of 3295 decks
+19% synergy
Sultai Ascendancy
24% of 118 decks
+22% synergy
Dreadhorde Invasion
23% of 3330 decks
+21% synergy
Parallel Lives
23% of 118 decks
+16% synergy
Necromancer's Covenant
22% of 515 decks
+22% synergy
Reconnaissance
21% of 515 decks
+19% synergy
Dictate of Erebos
21% of 3341 decks
+17% synergy
Open the Graves
21% of 3336 decks
+20% synergy
Funeral Room // Awakening Hall
19% of 424 decks
+14% synergy
Phyrexian Arena
18% of 3344 decks
+3% synergy
Goblin Bombardment
18% of 142 decks
+11% synergy
Liliana's Mastery
18% of 3340 decks
+17% synergy
Insidious Roots
17% of 41 decks
+9% synergy
Reflections of Littjara
17% of 3301 decks
+12% synergy
Knowledge Is Power
16% of 176 decks
+14% synergy
Black Market Connections
15% of 2766 decks
+4% synergy
Bastion of Remembrance
15% of 3313 decks
+8% synergy
Seal of Primordium
14% of 118 decks
+13% synergy
Doubling Season
14% of 118 decks
+5% synergy
Impact Tremors
14% of 141 decks
+5% synergy
Animate Dead
13% of 3344 decks
+4% synergy
Mystic Remora
11% of 3344 decks
-7% synergy
Black Market
11% of 3344 decks
+6% synergy
Path of Discovery
10% of 118 decks
+9% synergy
Deadbridge Chant
9% of 118 decks
+7% synergy
Cryptolith Rite
9% of 118 decks
+6% synergy
Into the Pit
9% of 249 decks
+4% synergy
Curse of the Restless Dead
9% of 3295 decks
+8% synergy
Land Tax
9% of 515 decks
+2% synergy
Training Grounds
8% of 3344 decks
+5% synergy
Shared Animosity
8% of 142 decks
+3% synergy
Etchings of the Chosen
8% of 511 decks
+4% synergy
Virtue of Persistence
7% of 1534 decks
+4% synergy
Graf Harvest
7% of 3341 decks
+7% synergy
Call to the Grave
7% of 3344 decks
+7% synergy
Pernicious Deed
7% of 118 decks
+5% synergy
Underworld Breach
7% of 136 decks
+1% synergy
Caretaker's Talent
6% of 64 decks
-6% synergy
Ripples of Undeath
6% of 802 decks
-0% synergy
Gift of Immortality
6% of 515 decks
+4% synergy
Tombstone Stairwell
6% of 3344 decks
+6% synergy
Exploration
6% of 118 decks
-2% synergy
Oversold Cemetery
6% of 3344 decks
+4% synergy
Secrets of the Dead
5% of 3344 decks
+5% synergy
Battles
Invasion of Amonkhet
7% of 1961 decks
+5% synergy
Planeswalkers
Liliana, Dreadhorde General
34% of 3330 decks
+31% synergy
Liliana, Untouched by Death
30% of 3336 decks
+30% synergy
Liliana, Death's Majesty
30% of 3340 decks
+28% synergy
Wrenn and Realmbreaker
13% of 70 decks
+11% synergy
Liliana, the Last Hope
8% of 3341 decks
+7% synergy
Utility Lands
Urborg, Tomb of Yawgmoth
53% of 3344 decks
+44% synergy
Bojuka Bog
49% of 3344 decks
+19% synergy
Three Tree City
45% of 594 decks
+36% synergy
Unholy Grotto
42% of 3344 decks
+41% synergy
Cabal Coffers
40% of 3344 decks
+29% synergy
Field of the Dead
35% of 3326 decks
+31% synergy
Phyrexian Tower
34% of 3344 decks
+26% synergy
Reliquary Tower
30% of 3344 decks
+1% synergy
Takenuma, Abandoned Mire
27% of 2995 decks
+16% synergy
Boseiju, Who Endures
23% of 112 decks
+4% synergy
Mortuary Mire
23% of 3341 decks
+18% synergy
Shifting Woodland
19% of 27 decks
+9% synergy
Crypt of Agadeem
17% of 3344 decks
+16% synergy
Otawara, Soaring City
17% of 2995 decks
-0% synergy
Nykthos, Shrine to Nyx
13% of 3343 decks
+8% synergy
Ancient Tomb
12% of 3344 decks
+2% synergy
Vault of the Archangel
12% of 515 decks
+1% synergy
Hall of Heliod's Generosity
10% of 511 decks
+3% synergy
Castle Locthwain
10% of 3321 decks
+4% synergy
Spymaster's Vault
8% of 906 decks
+4% synergy
High Market
7% of 3344 decks
+4% synergy
Restless Reef
7% of 1267 decks
+4% synergy
Witch's Cottage
6% of 3321 decks
+2% synergy
Academy Ruins
6% of 3344 decks
+1% synergy
Rogue's Passage
6% of 3344 decks
-14% synergy
Temple of the False God
5% of 3344 decks
-4% synergy
Dryad Arbor
5% of 118 decks
+1% synergy
Mana Artifacts
Sol Ring
95% of 3344 decks
+11% synergy
Arcane Signet
88% of 3321 decks
+15% synergy
Talisman of Dominance
59% of 3344 decks
+27% synergy
Dimir Signet
55% of 3344 decks
+25% synergy
Talisman of Hierarchy
38% of 511 decks
+14% synergy
Relic of Sauron
35% of 62 decks
+24% synergy
Orzhov Signet
34% of 515 decks
+7% synergy
Crowded Crypt
30% of 3295 decks
+28% synergy
Patchwork Banner
30% of 497 decks
+20% synergy
Rakdos Signet
29% of 142 decks
-1% synergy
Talisman of Indulgence
25% of 142 decks
-2% synergy
Fellwar Stone
22% of 3344 decks
+1% synergy
Talisman of Progress
21% of 515 decks
-2% synergy
Azorius Signet
20% of 515 decks
-5% synergy
Talisman of Creativity
20% of 139 decks
-9% synergy
Commander's Sphere
20% of 3341 decks
+5% synergy
Izzet Signet
20% of 142 decks
-8% synergy
Golgari Signet
17% of 118 decks
+4% synergy
Thought Vessel
15% of 3341 decks
-2% synergy
Mind Stone
14% of 3344 decks
-4% synergy
Talisman of Resilience
11% of 118 decks
-1% synergy
Mana Crypt
10% of 3344 decks
+2% synergy
Talisman of Curiosity
9% of 118 decks
-3% synergy
Simic Signet
9% of 118 decks
-5% synergy
Obelisk of Grixis
9% of 142 decks
+8% synergy
Chromatic Lantern
7% of 3344 decks
-3% synergy
Charcoal Diamond
6% of 3344 decks
+1% synergy
Heraldic Banner
6% of 3321 decks
+4% synergy
Jeweled Lotus
5% of 3308 decks
-0% synergy
Lands
Command Tower
93% of 3344 decks
+19% synergy
Sunken Hollow
70% of 3341 decks
+35% synergy
Raffine's Tower
69% of 487 decks
+41% synergy
Overgrown Tomb
67% of 118 decks
+25% synergy
Godless Shrine
66% of 515 decks
+25% synergy
Watery Grave
63% of 3344 decks
+22% synergy
Xander's Lounge
62% of 130 decks
+35% synergy
Zagoth Triome
61% of 118 decks
+31% synergy
Blood Crypt
58% of 142 decks
+19% synergy
Breeding Pool
58% of 118 decks
+17% synergy
Hallowed Fountain
56% of 515 decks
+15% synergy
Drowned Catacomb
56% of 3344 decks
+30% synergy
Crumbling Necropolis
54% of 142 decks
+22% synergy
Arcane Sanctum
49% of 515 decks
+21% synergy
Tainted Isle
49% of 3344 decks
+37% synergy
Shipwreck Marsh
48% of 3295 decks
+29% synergy
Choked Estuary
47% of 3341 decks
+31% synergy
Woodland Cemetery
47% of 118 decks
+19% synergy
Dragonskull Summit
46% of 142 decks
+15% synergy
Underground Mortuary
45% of 44 decks
+29% synergy
Morphic Pool
45% of 3338 decks
+19% synergy
Steam Vents
44% of 142 decks
+5% synergy
Indatha Triome
43% of 14 decks
+12% synergy
Isolated Chapel
43% of 515 decks
+15% synergy
Vault of Champions
42% of 507 decks
+17% synergy
Path of Ancestry
42% of 3339 decks
+21% synergy
Opulent Palace
42% of 118 decks
+15% synergy
Polluted Delta
39% of 3344 decks
+27% synergy
Ziatora's Proving Ground
38% of 13 decks
+7% synergy
The World Tree
38% of 13 decks
+5% synergy
Darkwater Catacombs
38% of 3344 decks
+23% synergy
Underground River
37% of 3344 decks
+17% synergy
Hedge Maze
36% of 44 decks
+22% synergy
Undergrowth Stadium
36% of 117 decks
+10% synergy
Temple of Deceit
35% of 3343 decks
+18% synergy
Exotic Orchard
34% of 3344 decks
-1% synergy
Dimir Aqueduct
34% of 3344 decks
+17% synergy
Undercity Sewers
33% of 1209 decks
+20% synergy
Sea of Clouds
33% of 515 decks
+7% synergy
Caves of Koilos
32% of 515 decks
+4% synergy
Gloomlake Verge
32% of 424 decks
+14% synergy
Clearwater Pathway
32% of 3310 decks
+22% synergy
Luxury Suite
31% of 140 decks
+5% synergy
Smoldering Marsh
31% of 141 decks
-1% synergy
Unclaimed Territory
30% of 3339 decks
+25% synergy
Rejuvenating Springs
30% of 117 decks
+1% synergy
Llanowar Wastes
29% of 118 decks
+3% synergy
Cavern of Souls
29% of 3344 decks
+22% synergy
Seething Landscape
28% of 25 decks
+13% synergy
Sulfur Falls
26% of 142 decks
-5% synergy