Gravespawn Sovereign + Intruder Alarm + Ashnod's Altar

Gravespawn Sovereign
Intruder Alarm
Ashnod's Altar

Requires
Gravespawn Sovereign must be on the battlefield. Intruder Alarm must be on the battlefield. Ashnod's Altar must be on the battlefield. You control at least four other Zombies and an additional nontoken creature.
Steps
  1. Activate Ashnod's Altar by sacrificing a nontoken creature, adding .
  2. Activate Gravespawn Sovereign by tapping five untapped Zombies you control, returning any creature from your graveyard to the battlefield.
  3. The creature enters the battlefield, triggering Intruder Alarm, untapping all creatures.
  4. Repeat.
Results
Infinite colorless mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers. Infinite untap of creatures.

Gisa and Geralf
0.09% of 4306 decks 4 decks
Wilhelt, the Rotcleaver
0.08% of 18651 decks 15 decks
Varina, Lich Queen
0.07% of 6774 decks 5 decks
High Synergy Cards
Gravecrawler
82% of 38 decks +80% synergy
Diregraf Captain
76% of 38 decks +75% synergy
Rooftop Storm
74% of 38 decks +73% synergy
Diregraf Colossus
74% of 38 decks +73% synergy
Top Cards
Cleaver Skaab
71% of 38 decks +70% synergy
Undead Augur
66% of 38 decks +65% synergy
Gisa and Geralf
63% of 38 decks +63% synergy
Gray Merchant of Asphodel
61% of 38 decks +56% synergy
Necroduality
58% of 38 decks +57% synergy
Headless Rider
58% of 38 decks +57% synergy
Empty the Laboratory
55% of 38 decks +55% synergy
Wilhelt, the Rotcleaver
55% of 38 decks +55% synergy
Death Baron
55% of 38 decks +54% synergy
Zombie Apocalypse
53% of 38 decks +52% synergy
Creatures
Warren Soultrader
75% of 4 decks +71% synergy
Carrion Feeder
53% of 38 decks +50% synergy
Cemetery Reaper
47% of 38 decks +46% synergy
Mikaeus, the Unhallowed
47% of 38 decks +46% synergy
Midnight Reaper
47% of 38 decks +45% synergy
Hordewing Skaab
45% of 38 decks +44% synergy
Ghoulcaller Gisa
45% of 38 decks +44% synergy
God-Eternal Oketra
43% of 7 decks +42% synergy
Corpse Knight
43% of 7 decks +42% synergy
Cryptbreaker
42% of 38 decks +41% synergy
Havengul Lich
39% of 38 decks +39% synergy
Lord of the Accursed
39% of 38 decks +39% synergy
Fleshbag Marauder
39% of 38 decks +37% synergy
Champion of the Perished
37% of 38 decks +36% synergy
Geralf, Visionary Stitcher
34% of 38 decks +34% synergy
Plague Belcher
34% of 38 decks +34% synergy
Tomb Tyrant
34% of 38 decks +34% synergy
Overcharged Amalgam
34% of 38 decks +34% synergy
Archghoul of Thraben
32% of 38 decks +31% synergy
Vengeful Dead
32% of 38 decks +31% synergy
Gleaming Overseer
32% of 38 decks +31% synergy
Grimgrin, Corpse-Born
29% of 38 decks +29% synergy
Undead Alchemist
29% of 38 decks +29% synergy
Noxious Ghoul
29% of 38 decks +28% synergy
Undead Warchief
29% of 38 decks +28% synergy
Feral Ghoul
27% of 11 decks +26% synergy
Mirkwood Bats
27% of 22 decks +21% synergy
Poppet Stitcher
26% of 38 decks +26% synergy
Forgotten Creation
26% of 38 decks +26% synergy
Lord of the Undead
26% of 38 decks +26% synergy
The Scarab God
26% of 38 decks +26% synergy
Sidisi, Undead Vizier
26% of 38 decks +25% synergy
Vizier of the Scorpion
24% of 38 decks +23% synergy
Ravenous Rotbelly
24% of 38 decks +23% synergy
Corpse Augur
24% of 38 decks +23% synergy
Relentless Dead
24% of 38 decks +23% synergy
Lich Lord of Unx
21% of 38 decks +21% synergy
Graveborn Muse
21% of 38 decks +21% synergy
Eternal Skylord
21% of 38 decks +21% synergy
Vile Entomber
21% of 38 decks +20% synergy
Murderous Rider
21% of 38 decks +20% synergy
Syr Konrad, the Grim
21% of 38 decks +17% synergy
Drivnod, Carnage Dominus
20% of 25 decks +18% synergy
Grave Titan
18% of 38 decks +17% synergy
Titan of Littjara
17% of 18 decks +16% synergy
Rot Hulk
16% of 38 decks +16% synergy
Unbreathing Horde
16% of 38 decks +16% synergy
Noosegraf Mob
16% of 38 decks +16% synergy
Putrid Goblin
16% of 38 decks +16% synergy
Acererak the Archlich
16% of 38 decks +15% synergy
Instants
Swords to Plowshares
43% of 7 decks +14% synergy
Entomb
26% of 38 decks +23% synergy
Counterspell
26% of 38 decks +5% synergy
Vampiric Tutor
24% of 38 decks +14% synergy
Dark Ritual
24% of 38 decks +13% synergy
Rise of the Dread Marn
21% of 38 decks +21% synergy
Village Rites
21% of 38 decks +16% synergy
Negate
21% of 38 decks +10% synergy
Plumb the Forbidden
18% of 38 decks +17% synergy
Go for the Throat
18% of 38 decks +15% synergy
Cyclonic Rift
18% of 38 decks +4% synergy
Lazotep Plating
16% of 38 decks +15% synergy
Frantic Search
16% of 38 decks +10% synergy
Tragic Slip
13% of 38 decks +11% synergy
Mana Drain
13% of 38 decks +6% synergy
Fierce Guardianship
13% of 38 decks +4% synergy
Brainstorm
13% of 38 decks +2% synergy
An Offer You Can't Refuse
12% of 33 decks +2% synergy
Malakir Rebirth
11% of 38 decks +6% synergy
Deadly Rollick
11% of 38 decks +5% synergy
Mausoleum Secrets
8% of 38 decks +8% synergy
Aetherspouts
8% of 38 decks +7% synergy
Drown in the Loch
8% of 38 decks +6% synergy
Fact or Fiction
8% of 38 decks +4% synergy
Infernal Grasp
8% of 38 decks +4% synergy
Arcane Denial
8% of 38 decks -2% synergy
Sorceries
Feed the Swarm
39% of 38 decks +30% synergy
Reanimate
37% of 38 decks +29% synergy
Diabolic Intent
34% of 38 decks +30% synergy
Distant Melody
32% of 38 decks +29% synergy
Victimize
29% of 38 decks +23% synergy
Dread Summons
26% of 38 decks +26% synergy
Army of the Damned
26% of 38 decks +25% synergy
Dread Return
24% of 38 decks +21% synergy
Lich-Knights' Conquest
24% of 17 decks +22% synergy
Demonic Tutor
21% of 38 decks +9% synergy
Ghouls' Night Out
18% of 38 decks +18% synergy
Dark Salvation
18% of 38 decks +18% synergy
Buried Alive
16% of 38 decks +13% synergy
Necrotic Hex
13% of 38 decks +13% synergy
Patriarch's Bidding
13% of 38 decks +11% synergy
Living Death
13% of 38 decks +10% synergy
Persist
11% of 38 decks +9% synergy
Diabolic Tutor
11% of 38 decks +7% synergy
Toxic Deluge
11% of 38 decks +2% synergy
Ghoulcaller's Chant
8% of 38 decks +8% synergy
Exhume
8% of 38 decks +7% synergy
Eaten Alive
8% of 38 decks +7% synergy
Crippling Fear
8% of 38 decks +7% synergy
Ravenform
8% of 38 decks +6% synergy
Sign in Blood
8% of 38 decks +3% synergy
Ponder
8% of 38 decks +1% synergy
Utility Artifacts
Phyrexian Altar
50% of 38 decks +46% synergy
Altar of Dementia
37% of 38 decks +34% synergy
Skullclamp
26% of 38 decks +14% synergy
Herald's Horn
21% of 38 decks +15% synergy
Wand of Orcus
18% of 38 decks +18% synergy
Pyre of Heroes
16% of 38 decks +15% synergy
Bontu's Monument
13% of 38 decks +11% synergy
Wayfarer's Bauble
13% of 38 decks +3% synergy
Nim Deathmantle
11% of 38 decks +10% synergy
Altar of the Brood
11% of 38 decks +9% synergy
Expedition Map
11% of 38 decks +7% synergy
Bolas's Citadel
11% of 38 decks +6% synergy
Lightning Greaves
11% of 38 decks -15% synergy
Blasting Station
8% of 38 decks +7% synergy
Alhammarret's Archive
8% of 38 decks +6% synergy
Swiftfoot Boots
8% of 38 decks -20% synergy
Enchantments
Endless Ranks of the Dead
50% of 38 decks +49% synergy
Dreadhorde Invasion
34% of 38 decks +33% synergy
Grave Pact
24% of 38 decks +21% synergy
Kindred Discovery
24% of 38 decks +20% synergy
Open the Graves
21% of 38 decks +20% synergy
Virtue of Persistence
20% of 15 decks +18% synergy
The Meathook Massacre
18% of 38 decks +16% synergy
Reflections of Littjara
18% of 38 decks +16% synergy
Liliana's Mastery
16% of 38 decks +15% synergy
Bastion of Remembrance
16% of 38 decks +13% synergy
Phyrexian Arena
13% of 38 decks +6% synergy
Faces of the Past
11% of 38 decks +10% synergy
Necromancer's Stockpile
11% of 38 decks +10% synergy
Zombie Infestation
11% of 38 decks +10% synergy
Curse of the Restless Dead
11% of 38 decks +10% synergy
Rhystic Study
11% of 38 decks -3% synergy
Call to the Grave
8% of 38 decks +8% synergy
Tortured Existence
8% of 38 decks +7% synergy
Black Market
8% of 38 decks +5% synergy
Planeswalkers
Liliana, Death's Majesty
34% of 38 decks +33% synergy
Liliana, Dreadhorde General
21% of 38 decks +19% synergy
Liliana, Untouched by Death
18% of 38 decks +18% synergy
Utility Lands
Bojuka Bog
42% of 38 decks +27% synergy
Cabal Coffers
39% of 38 decks +34% synergy
Urborg, Tomb of Yawgmoth
37% of 38 decks +27% synergy
Field of the Dead
29% of 38 decks +25% synergy
Unholy Grotto
26% of 38 decks +26% synergy
Mortuary Mire
26% of 38 decks +24% synergy
Reliquary Tower
24% of 38 decks -5% synergy
Crypt of Agadeem
16% of 38 decks +15% synergy
Phyrexian Tower
16% of 38 decks +11% synergy
Takenuma, Abandoned Mire
11% of 36 decks +5% synergy
Castle Locthwain
11% of 38 decks +8% synergy
Nykthos, Shrine to Nyx
11% of 38 decks +5% synergy
Mystic Sanctuary
11% of 38 decks +4% synergy
Witch's Cottage
8% of 38 decks +6% synergy
Temple of the False God
8% of 38 decks -2% synergy
Mana Artifacts
Sol Ring
92% of 38 decks +8% synergy
Arcane Signet
84% of 38 decks +13% synergy
Talisman of Dominance
63% of 38 decks +55% synergy
Dimir Signet
58% of 38 decks +50% synergy
Talisman of Progress
43% of 7 decks +38% synergy
Talisman of Hierarchy
43% of 7 decks +37% synergy
Azorius Signet
43% of 7 decks +37% synergy
Orzhov Signet
43% of 7 decks +37% synergy
Crowded Crypt
42% of 38 decks +41% synergy
Commander's Sphere
26% of 38 decks +10% synergy
Thought Vessel
21% of 38 decks +5% synergy
Sky Diamond
13% of 38 decks +11% synergy
Mind Stone
13% of 38 decks -5% synergy
Fellwar Stone
13% of 38 decks -8% synergy
Charcoal Diamond
11% of 38 decks +8% synergy
Chrome Mox
8% of 38 decks +1% synergy
Jeweled Lotus
8% of 38 decks +0% synergy
Mana Crypt
8% of 38 decks -3% synergy
Lands
Command Tower
89% of 38 decks +16% synergy
Sunken Hollow
76% of 38 decks +68% synergy
Choked Estuary
58% of 38 decks +54% synergy
Watery Grave
58% of 38 decks +48% synergy
Hallowed Fountain
57% of 7 decks +48% synergy
Path of Ancestry
55% of 38 decks +34% synergy
Drowned Catacomb
50% of 38 decks +44% synergy
Glacial Fortress
43% of 7 decks +37% synergy
Godless Shrine
43% of 7 decks +34% synergy
Undercity Sewers
40% of 10 decks +37% synergy
Dimir Aqueduct
39% of 38 decks +35% synergy
Myriad Landscape
39% of 38 decks +19% synergy
Tainted Isle
37% of 38 decks +34% synergy
Darkwater Catacombs
37% of 38 decks +33% synergy
Temple of Deceit
37% of 38 decks +33% synergy
Unclaimed Territory
34% of 38 decks +29% synergy
Shipwreck Marsh
32% of 38 decks +27% synergy
Underground River
29% of 38 decks +24% synergy
Evolving Wilds
29% of 38 decks +8% synergy
Exotic Orchard
29% of 38 decks -6% synergy
Morphic Pool
26% of 38 decks +20% synergy
Polluted Delta
26% of 38 decks +15% synergy
Terramorphic Expanse
26% of 38 decks +11% synergy
Secluded Courtyard
25% of 36 decks +20% synergy
Ice Tunnel
21% of 38 decks +20% synergy
Sunken Ruins
18% of 38 decks +17% synergy
Clearwater Pathway
16% of 38 decks +13% synergy
Cavern of Souls
16% of 38 decks +9% synergy
Fetid Pools
13% of 38 decks +12% synergy
Port of Karfell
11% of 38 decks +10% synergy
Darkslick Shores
11% of 38 decks +9% synergy
Dismal Backwater
11% of 38 decks +9% synergy
Fabled Passage
11% of 38 decks +1% synergy
Bloodstained Mire
11% of 38 decks +0% synergy
Flooded Strand
11% of 38 decks +0% synergy
Scalding Tarn
11% of 38 decks -1% synergy
Marsh Flats
11% of 38 decks -1% synergy
Verdant Catacombs
11% of 38 decks -1% synergy
Misty Rainforest
11% of 38 decks -1% synergy
Contaminated Aquifer
10% of 29 decks +9% synergy
Prismatic Vista
8% of 38 decks +2% synergy