Hell Mongrel (Card)
Hell Mongrel
In 4295 decks
0% of 2091763 decks
Oct 27, 2023
Flavor of the Month: Edgar Allan Poe (Real-World Flavor Text)
Quoth the Raven: "Do you pay the one?"
Top Commanders (3)
Anje Falkenrath
60.99% of 4868 decks
2969 decks
Asmoranomardicadaistinaculdacar
11.76% of 2839 decks
334 decks
Chainer, Nightmare Adept
2.62% of 3239 decks
85 decks
New Cards (5)
Psychic Frog
100% of 5 decks
+98% synergy
Emrakul, the World Anew
84% of 74 decks
+75% synergy
Jagged Barrens
28% of 136 decks
+26% synergy
Geyser Drake
27% of 11 decks
+27% synergy
Highway Robbery
11% of 136 decks
+10% synergy
High Synergy Cards (10)
Terminal Agony
92% of 3689 decks
+92% synergy
Big Game Hunter
84% of 4297 decks
+84% synergy
Fiery Temper
83% of 3691 decks
+82% synergy
Grave Scrabbler
81% of 4297 decks
+81% synergy
Dark Withering
81% of 4297 decks
+81% synergy
Call to the Netherworld
81% of 4297 decks
+81% synergy
Avacyn's Judgment
80% of 3691 decks
+80% synergy
Anje's Ravager
80% of 3691 decks
+80% synergy
Stromkirk Occultist
79% of 3691 decks
+79% synergy
Blazing Rootwalla
79% of 3691 decks
+79% synergy
Top Cards (10)
Necrogoyf
79% of 4297 decks
+79% synergy
Revolutionist
77% of 3691 decks
+77% synergy
Kitchen Imp
76% of 4297 decks
+76% synergy
Bloodhall Priest
74% of 3689 decks
+74% synergy
Alchemist's Greeting
72% of 3691 decks
+72% synergy
Gorgon Recluse
72% of 4297 decks
+72% synergy
Asylum Visitor
71% of 4297 decks
+71% synergy
Archfiend of Spite
71% of 4297 decks
+71% synergy
From Under the Floorboards
70% of 4297 decks
+70% synergy
Shadowgrange Archfiend
69% of 3994 decks
+68% synergy
Creatures (50)
Bloodmad Vampire
67% of 3691 decks
+67% synergy
Nightshade Assassin
66% of 4297 decks
+66% synergy
Muck Drubb
66% of 4297 decks
+66% synergy
Reckless Wurm
63% of 3691 decks
+63% synergy
Incorrigible Youths
62% of 3691 decks
+62% synergy
Skophos Reaver
59% of 3691 decks
+59% synergy
Voldaren Pariah
59% of 4297 decks
+59% synergy
Markov Baron
55% of 1764 decks
+54% synergy
Bone Miser
53% of 4297 decks
+53% synergy
Archfiend of Ifnir
52% of 4297 decks
+51% synergy
Glint-Horn Buccaneer
48% of 3691 decks
+47% synergy
Twins of Maurer Estate
46% of 4297 decks
+46% synergy
Worldgorger Dragon
43% of 3691 decks
+43% synergy
Chainer, Nightmare Adept
40% of 3689 decks
+39% synergy
Squee, Goblin Nabob
37% of 3691 decks
+36% synergy
Likeness Looter
35% of 99 decks
+34% synergy
Noose Constrictor
34% of 173 decks
+33% synergy
Brain Gorgers
33% of 4297 decks
+33% synergy
Rielle, the Everwise
32% of 62 decks
+32% synergy
Insatiable Gorgers
32% of 3691 decks
+32% synergy
Surly Badgersaur
31% of 3691 decks
+31% synergy
Wild Mongrel
31% of 173 decks
+31% synergy
Weirded Vampire
30% of 4297 decks
+30% synergy
Queza, Augur of Agonies
30% of 88 decks
+29% synergy
Zoyowa Lava-Tongue
29% of 536 decks
+29% synergy
Kathril, Aspect Warper
29% of 38 decks
+29% synergy
Kamiz, Obscura Oculus
28% of 88 decks
+28% synergy
Simian Spirit Guide
28% of 3691 decks
+25% synergy
Ghostly Pilferer
28% of 340 decks
+27% synergy
Vohar, Vodalian Desecrator
27% of 242 decks
+27% synergy
Lazotep Chancellor
26% of 340 decks
+26% synergy
Tayam, Luminous Enigma
26% of 38 decks
+26% synergy
Spirited Companion
23% of 171 decks
+21% synergy
Llanowar Elves
23% of 173 decks
+12% synergy
Containment Construct
22% of 3444 decks
+21% synergy
Magus of the Wheel
22% of 3691 decks
+20% synergy
Rona, Herald of Invasion
22% of 145 decks
+21% synergy
Obscura Interceptor
22% of 88 decks
+22% synergy
Inti, Seneschal of the Sun
22% of 637 decks
+21% synergy
Curator of Mysteries
21% of 340 decks
+21% synergy
Golgari Grave-Troll
21% of 173 decks
+21% synergy
Ramunap Excavator
21% of 173 decks
+18% synergy
Oskar, Rubbish Reclaimer
21% of 314 decks
+21% synergy
Vega, the Watcher
21% of 92 decks
+20% synergy
Brallin, Skyshark Rider
21% of 3691 decks
+20% synergy
Rambunctious Mutt
20% of 178 decks
+20% synergy
Pack Leader
20% of 178 decks
+20% synergy
Selfless Savior
20% of 178 decks
+20% synergy
Alpine Houndmaster
20% of 45 decks
+20% synergy
Loyal Warhound
20% of 176 decks
+19% synergy
Instants (50)
Violent Eruption
68% of 3691 decks
+67% synergy
Shadow of the Grave
60% of 4297 decks
+60% synergy
Dark Ritual
49% of 4297 decks
+38% synergy
Psychotic Haze
43% of 4297 decks
+43% synergy
Circular Logic
43% of 340 decks
+42% synergy
Chaos Warp
42% of 3691 decks
+27% synergy
Demand Answers
40% of 360 decks
+35% synergy
Swords to Plowshares
39% of 178 decks
+11% synergy
Void Rend
39% of 88 decks
+37% synergy
Abandon Reason
38% of 3691 decks
+38% synergy
Bitter Triumph
33% of 587 decks
+30% synergy
Frantic Search
32% of 340 decks
+26% synergy
Path to Exile
30% of 178 decks
+10% synergy
Red Elemental Blast
29% of 3691 decks
+26% synergy
Thrill of Possibility
29% of 3691 decks
+23% synergy
Obsessive Search
28% of 340 decks
+28% synergy
Crop Rotation
27% of 173 decks
+23% synergy
Dihada's Ploy
26% of 340 decks
+26% synergy
Counterspell
26% of 340 decks
+5% synergy
Faithful Mending
26% of 91 decks
+26% synergy
Tibalt's Trickery
25% of 3691 decks
+22% synergy
Pyroblast
25% of 3691 decks
+22% synergy
Just the Wind
24% of 340 decks
+24% synergy
Harrow
23% of 173 decks
+18% synergy
Obscura Charm
23% of 88 decks
+22% synergy
Songs of the Damned
23% of 4297 decks
+22% synergy
Beast Within
23% of 173 decks
+4% synergy
Entomb
22% of 4297 decks
+18% synergy
Frantic Purification
22% of 178 decks
+22% synergy
Deflecting Swat
21% of 3691 decks
+13% synergy
Vampiric Tutor
20% of 4297 decks
+10% synergy
Obscura Confluence
19% of 88 decks
+19% synergy
Despark
18% of 176 decks
+14% synergy
Assassin's Trophy
18% of 173 decks
+12% synergy
Putrefy
17% of 173 decks
+14% synergy
Crackling Doom
16% of 43 decks
+15% synergy
Grisly Salvage
16% of 173 decks
+15% synergy
Big Score
16% of 2739 decks
+11% synergy
Rakdos Charm
16% of 3689 decks
+12% synergy
Mausoleum Secrets
15% of 4297 decks
+15% synergy
Mortify
15% of 176 decks
+12% synergy
Negate
15% of 340 decks
+4% synergy
Tainted Indulgence
15% of 315 decks
+15% synergy
Terminate
15% of 3689 decks
+10% synergy
Fracture
15% of 176 decks
+13% synergy
Entish Restoration
14% of 64 decks
+10% synergy
Abrade
14% of 3691 decks
+8% synergy
Ancient Excavation
14% of 340 decks
+13% synergy
Dovin's Veto
13% of 92 decks
+8% synergy
Imp's Mischief
13% of 4297 decks
+11% synergy
Sorceries (50)
Murderous Compulsion
69% of 4297 decks
+68% synergy
Malevolent Whispers
61% of 3691 decks
+61% synergy
Biting Rain
57% of 4297 decks
+57% synergy
Faithless Looting
51% of 3691 decks
+43% synergy
Psychotic Episode
50% of 4297 decks
+50% synergy
Alms of the Vein
50% of 4297 decks
+50% synergy
Distemper of the Blood
43% of 3691 decks
+43% synergy
Ichor Slick
43% of 4297 decks
+43% synergy
Gisa's Bidding
38% of 4297 decks
+38% synergy
Change of Fortune
36% of 3484 decks
+36% synergy
Eerie Ultimatum
32% of 38 decks
+30% synergy
Rampant Growth
30% of 173 decks
+14% synergy
Cultivate
29% of 173 decks
+7% synergy
Gamble
28% of 3691 decks
+23% synergy
Feed the Swarm
28% of 4297 decks
+19% synergy
Blasphemous Act
22% of 3691 decks
+6% synergy
Demonic Tutor
22% of 4297 decks
+10% synergy
Gaea's Blessing
22% of 173 decks
+22% synergy
Sylvan Scrying
22% of 173 decks
+21% synergy
Welcome to the Fold
21% of 340 decks
+21% synergy
Life from the Loam
20% of 173 decks
+19% synergy
Windfall
20% of 340 decks
+13% synergy
Unmarked Grave
19% of 4297 decks
+18% synergy
Rite of Flame
19% of 3691 decks
+17% synergy
Kodama's Reach
18% of 173 decks
+2% synergy
Release the Dogs
16% of 178 decks
+16% synergy
Damn
16% of 176 decks
+12% synergy
Splendid Reclamation
16% of 173 decks
+14% synergy
Farseek
16% of 173 decks
-0% synergy
Cathartic Reunion
16% of 3691 decks
+14% synergy
Nagging Thoughts
14% of 340 decks
+14% synergy
Duneblast
13% of 38 decks
+13% synergy
Bone Shards
13% of 4297 decks
+12% synergy
Living Death
13% of 4297 decks
+10% synergy
Explore
13% of 173 decks
+9% synergy
Nature's Lore
13% of 173 decks
-2% synergy
Unburial Rites
12% of 176 decks
+12% synergy
Deep Analysis
12% of 340 decks
+11% synergy
Witch's Mark
12% of 732 decks
+11% synergy
Bygone Marvels
12% of 43 decks
+11% synergy
Three Visits
12% of 173 decks
-0% synergy
Thrilling Discovery
11% of 45 decks
+11% synergy
Tormenting Voice
11% of 3691 decks
+9% synergy
Edge of Autumn
10% of 173 decks
+10% synergy
Culling Ritual
10% of 173 decks
+8% synergy
Whispering Madness
10% of 340 decks
+10% synergy
Vindicate
10% of 176 decks
+8% synergy
Wrath of God
10% of 178 decks
+7% synergy
Imperial Seal
10% of 4297 decks
+7% synergy
Cut // Ribbons
10% of 3689 decks
+9% synergy
Utility Artifacts (18)
Collector's Vault
28% of 979 decks
+26% synergy
Grimoire of the Dead
24% of 4299 decks
+23% synergy
Conduit of Worlds
23% of 96 decks
+20% synergy
Brass's Tunnel-Grinder
21% of 637 decks
+19% synergy
Nuka-Cola Vending Machine
19% of 226 decks
+15% synergy
Wishclaw Talisman
16% of 4297 decks
+13% synergy
The Underworld Cookbook
16% of 4299 decks
+15% synergy
Matzalantli, the Great Door
15% of 783 decks
+13% synergy
Key to the City
13% of 4299 decks
+12% synergy
Bag of Holding
12% of 4299 decks
+12% synergy
Wayfarer's Bauble
11% of 4299 decks
-0% synergy
Swiftfoot Boots
11% of 4299 decks
-17% synergy
Lightning Greaves
10% of 4299 decks
-15% synergy
Currency Converter
9% of 3302 decks
+9% synergy
Cloudstone Curio
8% of 4299 decks
+7% synergy
Mask of the Schemer
7% of 314 decks
+7% synergy
Witch's Oven
7% of 4299 decks
+6% synergy
Mnemonic Sphere
6% of 323 decks
+5% synergy
Enchantments (50)
Curse of Fool's Wisdom
53% of 4297 decks
+52% synergy
Strength of Lunacy
45% of 4297 decks
+45% synergy
Animate Dead
44% of 4297 decks
+39% synergy
Faith of the Devoted
36% of 4297 decks
+36% synergy
Stensia Masquerade
36% of 3691 decks
+35% synergy
Senseless Rage
33% of 3691 decks
+33% synergy
Drake Haven
31% of 340 decks
+31% synergy
Dance of the Dead
28% of 4297 decks
+27% synergy
Feast of Sanity
27% of 4297 decks
+27% synergy
Gibbering Descent
27% of 4297 decks
+27% synergy
Necromancy
24% of 4297 decks
+23% synergy
Dying to Serve
19% of 4009 decks
+19% synergy
Mirari's Wake
18% of 38 decks
+15% synergy
Underworld Breach
17% of 3691 decks
+14% synergy
Ominous Seas
16% of 340 decks
+15% synergy
Secrets of the Dead
16% of 340 decks
+16% synergy
Teferi's Ageless Insight
16% of 340 decks
+13% synergy
Death's Oasis
13% of 38 decks
+13% synergy
Wild Growth
13% of 173 decks
+8% synergy
Tortured Existence
12% of 4297 decks
+11% synergy
Mystic Redaction
12% of 340 decks
+12% synergy
In the Darkness Bind Them
12% of 25 decks
+11% synergy
Passionate Archaeologist
12% of 2451 decks
+10% synergy
Etchings of the Chosen
11% of 176 decks
+11% synergy
Rally the Ranks
11% of 178 decks
+10% synergy
Ghostly Prison
11% of 178 decks
+5% synergy
Ayula's Influence
10% of 173 decks
+10% synergy
Smothering Tithe
10% of 178 decks
-2% synergy
Druid Class
10% of 166 decks
+8% synergy
Always Watching
9% of 178 decks
+9% synergy
Exploration
9% of 173 decks
+5% synergy
Zombie Infestation
9% of 4297 decks
+8% synergy
Chthonian Nightmare
8% of 83 decks
+6% synergy
Ominous Roost
8% of 333 decks
+8% synergy
Rhystic Study
8% of 340 decks
-6% synergy
Abundance
8% of 173 decks
+7% synergy
Scuttletide
8% of 340 decks
+8% synergy
Aura Shards
8% of 38 decks
+6% synergy
Chivalric Alliance
8% of 66 decks
+6% synergy
Phyrexian Arena
7% of 4297 decks
-0% synergy
Kindred Boon
7% of 178 decks
+7% synergy
Tectonic Reformation
6% of 3691 decks
+6% synergy
Greater Good
6% of 173 decks
+4% synergy
Wizard Class
6% of 333 decks
+4% synergy
Strength of Isolation
6% of 178 decks
+6% synergy
Authority of the Consuls
6% of 178 decks
+4% synergy
Crawling Sensation
6% of 173 decks
+5% synergy
Deadbridge Chant
6% of 173 decks
+5% synergy
Spirit Cairn
6% of 178 decks
+6% synergy
Cathars' Crusade
6% of 178 decks
+3% synergy
Battles (1)
Invasion of Amonkhet
5% of 136 decks
+5% synergy
Planeswalkers (5)
Ashiok, Nightmare Muse
9% of 340 decks
+8% synergy
Dakkon, Shadow Slayer
8% of 92 decks
+7% synergy
Teferi, Master of Time
6% of 340 decks
+5% synergy
Ashiok, Nightmare Weaver
6% of 340 decks
+6% synergy
Ashiok, Dream Render
6% of 340 decks
+5% synergy
Utility Lands (46)
Geier Reach Sanitarium
43% of 4299 decks
+39% synergy
Forgotten Cave
41% of 3691 decks
+39% synergy
Barren Moor
40% of 4297 decks
+38% synergy
Rix Maadi, Dungeon Palace
32% of 3689 decks
+32% synergy
Bojuka Bog
25% of 4297 decks
+9% synergy
Drownyard Temple
21% of 4299 decks
+20% synergy
Tranquil Thicket
19% of 173 decks
+17% synergy
Mortuary Mire
18% of 4297 decks
+15% synergy
Boseiju, Who Endures
17% of 157 decks
+7% synergy
Lonely Sandbar
16% of 340 decks
+15% synergy
Restless Vents
16% of 636 decks
+15% synergy
Desolate Lighthouse
13% of 62 decks
+12% synergy
Takenuma, Abandoned Mire
13% of 3502 decks
+7% synergy
Secluded Steppe
12% of 178 decks
+11% synergy
Sunscorched Desert
12% of 4299 decks
+11% synergy
Urborg, Tomb of Yawgmoth
11% of 4299 decks
+1% synergy
Remote Isle
10% of 340 decks
+10% synergy
Hidden Nursery
10% of 49 decks
+9% synergy
Reliquary Tower
10% of 4299 decks
-19% synergy
Restless Reef
10% of 62 decks
+9% synergy
Memorial to Folly
10% of 4297 decks
+9% synergy
Temple of the False God
9% of 4299 decks
-1% synergy
Otawara, Soaring City
9% of 325 decks
+1% synergy
Emergence Zone
9% of 4299 decks
+7% synergy
Mystic Sanctuary
9% of 340 decks
+2% synergy
Slippery Karst
9% of 173 decks
+8% synergy
Cabal Pit
9% of 4297 decks
+8% synergy
Gavony Township
8% of 38 decks
+6% synergy
Drifting Meadow
8% of 178 decks
+7% synergy
Desert of the Glorified
7% of 4297 decks
+7% synergy
Desert of the Mindful
7% of 340 decks
+7% synergy
Witch's Cottage
7% of 4297 decks
+5% synergy
Cabal Coffers
7% of 4297 decks
+1% synergy
Polluted Mire
7% of 4297 decks
+6% synergy
Desert of the Indomitable
7% of 173 decks
+6% synergy
Dryad Arbor
7% of 173 decks
+5% synergy
Idyllic Grange
7% of 178 decks
+6% synergy
Restless Fortress
7% of 45 decks
+6% synergy
Desert of the Fervent
6% of 3691 decks
+6% synergy
Castle Locthwain
6% of 4297 decks
+3% synergy
Desert of the True
6% of 178 decks
+6% synergy
Creeping Tar Pit
6% of 340 decks
+5% synergy
Smoldering Crater
6% of 3691 decks
+5% synergy
Sanctum of Eternity
6% of 4299 decks
+5% synergy
Sokenzan, Crucible of Defiance
6% of 2928 decks
+3% synergy
Eiganjo, Seat of the Empire
5% of 172 decks
+1% synergy
Mana Artifacts (42)
Sol Ring
83% of 4299 decks
-1% synergy
Arcane Signet
65% of 4299 decks
-6% synergy
Rakdos Signet
53% of 3689 decks
+46% synergy
Dimir Signet
41% of 340 decks
+33% synergy
Talisman of Indulgence
38% of 3689 decks
+32% synergy
Orzhov Signet
34% of 176 decks
+27% synergy
Mind Stone
25% of 4299 decks
+7% synergy
Azorius Signet
25% of 92 decks
+19% synergy
Talisman of Dominance
25% of 340 decks
+17% synergy
Boros Signet
24% of 45 decks
+19% synergy
Simic Signet
23% of 57 decks
+19% synergy
Izzet Signet
23% of 62 decks
+16% synergy
Talisman of Hierarchy
22% of 176 decks
+16% synergy
Relic of Sauron
20% of 25 decks
+18% synergy
Golgari Signet
20% of 173 decks
+17% synergy
Talisman of Creativity
19% of 62 decks
+13% synergy
Talisman of Progress
18% of 92 decks
+14% synergy
Lotus Petal
16% of 4299 decks
+10% synergy
Fellwar Stone
16% of 4299 decks
-5% synergy
Commander's Sphere
14% of 4299 decks
-2% synergy
Gruul Signet
14% of 37 decks
+11% synergy
Mana Crypt
13% of 4299 decks
+2% synergy
Chrome Mox
13% of 4299 decks
+6% synergy
Talisman of Curiosity
12% of 57 decks
+10% synergy
Talisman of Resilience
12% of 173 decks
+10% synergy
Jeweled Lotus
12% of 4299 decks
+4% synergy
Boros Locket
11% of 45 decks
+11% synergy
Talisman of Conviction
11% of 45 decks
+6% synergy
Charcoal Diamond
10% of 4297 decks
+7% synergy
Rakdos Locket
9% of 3689 decks
+9% synergy
Sultai Banner
9% of 57 decks
+9% synergy
Sky Diamond
8% of 340 decks
+5% synergy
Fire Diamond
8% of 3691 decks
+5% synergy
Orzhov Locket
8% of 176 decks
+8% synergy
Indatha Crystal
8% of 38 decks
+8% synergy
Selesnya Signet
8% of 38 decks
+6% synergy
Hedron Archive
7% of 4299 decks
+4% synergy
Zagoth Crystal
7% of 57 decks
+7% synergy
Mardu Banner
7% of 43 decks
+7% synergy
Mox Diamond
7% of 4299 decks
+2% synergy
Lion's Eye Diamond
5% of 4299 decks
+4% synergy
Marble Diamond
5% of 178 decks
+3% synergy
Lands (50)
Command Tower
83% of 4299 decks
+10% synergy
Lush Portico
57% of 7 decks
+54% synergy
Crumbling Necropolis
55% of 62 decks
+51% synergy
Smoldering Marsh
49% of 3689 decks
+42% synergy
Raffine's Tower
48% of 88 decks
+44% synergy
Dragonskull Summit
47% of 3689 decks
+40% synergy
Blood Crypt
45% of 3689 decks
+35% synergy
Underground Mortuary
44% of 25 decks
+39% synergy
Xander's Lounge
43% of 58 decks
+39% synergy
Arcane Sanctum
42% of 92 decks
+39% synergy
Shadowy Backstreet
42% of 19 decks
+38% synergy
Exotic Orchard
41% of 4299 decks
+7% synergy
Raucous Theater
41% of 359 decks
+38% synergy
Sunken Hollow
41% of 340 decks
+32% synergy
Temple Garden
39% of 38 decks
+30% synergy
Rakdos Carnarium
39% of 3689 decks
+36% synergy
Elegant Parlor
38% of 8 decks
+35% synergy
Sulfurous Springs
37% of 3689 decks
+33% synergy
Luxury Suite
37% of 3689 decks
+31% synergy
Indatha Triome
37% of 38 decks
+33% synergy
Spara's Headquarters
36% of 14 decks
+32% synergy
Ziatora's Proving Ground
35% of 34 decks
+32% synergy
Godless Shrine
35% of 176 decks
+26% synergy
Foreboding Ruins
35% of 3689 decks
+32% synergy
Prairie Stream
35% of 92 decks
+27% synergy
Sandsteppe Citadel
34% of 38 decks
+31% synergy
Ketria Triome
33% of 15 decks
+30% synergy
Ash Barrens
33% of 4299 decks
+28% synergy
Zagoth Triome
32% of 57 decks
+28% synergy
Breeding Pool
32% of 57 decks
+22% synergy
Overgrown Tomb
31% of 173 decks
+21% synergy
Savai Triome
30% of 43 decks
+27% synergy
Stomping Ground
30% of 37 decks
+21% synergy
Hallowed Fountain
29% of 92 decks
+20% synergy
Sulfur Falls
29% of 62 decks
+23% synergy
Caves of Koilos
29% of 176 decks
+23% synergy
Golgari Rot Farm
28% of 173 decks
+25% synergy
Llanowar Wastes
28% of 173 decks
+23% synergy
Nomad Outpost
28% of 43 decks
+25% synergy
Orzhov Basilica
28% of 176 decks
+24% synergy
Dimir Aqueduct
28% of 340 decks
+23% synergy
Tainted Peak
27% of 3689 decks
+25% synergy
The World Tree
27% of 15 decks
+24% synergy
Myriad Landscape
26% of 4299 decks
+6% synergy
Opulent Palace
26% of 57 decks
+23% synergy
Canopy Vista
26% of 38 decks
+19% synergy
Shadowblood Ridge
26% of 3689 decks
+24% synergy
Isolated Chapel
26% of 176 decks
+20% synergy
Watery Grave
26% of 340 decks
+15% synergy
Choked Estuary
25% of 340 decks
+21% synergy