Workhorse + Nim Deathmantle + Ashnod's Altar + Purphoros, God of the Forge

Workhorse
Nim Deathmantle
Ashnod's Altar
Purphoros, God of the Forge

Requires
Workhorse must be on the battlefield. Nim Deathmantle must be on the battlefield. Ashnod's Altar must be on the battlefield. Purphoros, God of the Forge must be on the battlefield. Nim Deathmantle attached to Workhorse.
Steps
  1. Activate Workhorse by removing four +1/+1 counters, adding .
  2. Activate Ashnod's Altar by sacrificing Workhorse, adding .
  3. Workhorse dies, triggering Nim Deathmantle, causing you to pay 4 to return Workhorse from your graveyard to the battlefield, and attach Nim Deathmantle to it.
  4. Workhorse enters the battlefield with four +1/+1 counters on it.
  5. Purphoros triggers, dealing 2 damages to each opponent.
  6. Repeat.
Results
Infinite colorless mana. Infinite damage. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

Grenzo, Dungeon Warden
0.31% of 3264 decks 10 decks
Purphoros, God of the Forge
0.05% of 3699 decks 2 decks
High Synergy Cards
Murderous Redcap
82% of 11 decks +81% synergy
Viscera Seer
82% of 11 decks +77% synergy
The Cauldron of Eternity
73% of 11 decks +73% synergy
Pitiless Plunderer
73% of 11 decks +69% synergy
Sling-Gang Lieutenant
64% of 11 decks +63% synergy
Top Cards
Zulaport Cutthroat
64% of 11 decks +58% synergy
Skirk Prospector
56% of 16 decks +55% synergy
Kiki-Jiki, Mirror Breaker
56% of 16 decks +54% synergy
Impact Tremors
56% of 16 decks +52% synergy
Skullclamp
56% of 16 decks +44% synergy
Priest of Gix
55% of 11 decks +54% synergy
Chainer, Nightmare Adept
55% of 11 decks +53% synergy
Pawn of Ulamog
55% of 11 decks +53% synergy
Plaguecrafter
55% of 11 decks +52% synergy
Gray Merchant of Asphodel
55% of 11 decks +50% synergy
Creatures
Hoverstone Pilgrim
60% of 5 decks +60% synergy
Krenko, Mob Boss
50% of 16 decks +49% synergy
Siege-Gang Commander
50% of 16 decks +49% synergy
Priest of Urabrask
44% of 16 decks +44% synergy
Goblin Welder
44% of 16 decks +42% synergy
Imperial Recruiter
44% of 16 decks +41% synergy
Epitaph Golem
38% of 16 decks +37% synergy
Junktroller
38% of 16 decks +37% synergy
Goblin Matron
38% of 16 decks +36% synergy
Anger
38% of 16 decks +35% synergy
Dockside Extortionist
38% of 16 decks +30% synergy
Solemn Simulacrum
38% of 16 decks +23% synergy
Mad Auntie
36% of 11 decks +36% synergy
Deathbringer Thoctar
36% of 11 decks +36% synergy
Judith, the Scourge Diva
36% of 11 decks +36% synergy
Phyrexian Delver
36% of 11 decks +36% synergy
Woe Strider
36% of 11 decks +35% synergy
Crypt Ghast
36% of 11 decks +34% synergy
Blood Artist
36% of 11 decks +30% synergy
Emrakul's Hatcher
31% of 16 decks +31% synergy
Goblin Sharpshooter
31% of 16 decks +31% synergy
Goblin Trashmaster
31% of 16 decks +31% synergy
Zealous Conscripts
31% of 16 decks +30% synergy
Goblin Engineer
31% of 16 decks +29% synergy
Meteor Golem
31% of 16 decks +29% synergy
Leaden Myr
27% of 11 decks +26% synergy
Mikaeus, the Unhallowed
27% of 11 decks +26% synergy
Marionette Master
27% of 11 decks +25% synergy
Beetleback Chief
25% of 16 decks +24% synergy
Goblin Chieftain
25% of 16 decks +24% synergy
Treasonous Ogre
25% of 16 decks +24% synergy
Goblin Warchief
25% of 16 decks +24% synergy
Metallic Mimic
25% of 16 decks +24% synergy
Palladium Myr
25% of 16 decks +23% synergy
Tuktuk Scrapper
19% of 16 decks +19% synergy
Lightning Crafter
19% of 16 decks +19% synergy
Moggcatcher
19% of 16 decks +19% synergy
Goblin Chirurgeon
19% of 16 decks +18% synergy
Goblin Recruiter
19% of 16 decks +18% synergy
Pashalik Mons
19% of 16 decks +18% synergy
Duplicant
19% of 16 decks +18% synergy
Combat Celebrant
19% of 16 decks +17% synergy
Iron Myr
19% of 16 decks +17% synergy
Instants
Valakut Awakening
36% of 14 decks +32% synergy
Vampiric Tutor
27% of 11 decks +18% synergy
Chaos Warp
25% of 16 decks +9% synergy
Sorceries
Blasphemous Act
31% of 16 decks +15% synergy
Jeska's Will
29% of 14 decks +20% synergy
Diabolic Intent
27% of 11 decks +23% synergy
Gamble
19% of 16 decks +14% synergy
Utility Artifacts
Heartstone
50% of 16 decks +49% synergy
Tel-Jilad Stylus
44% of 16 decks +44% synergy
Thornbite Staff
44% of 16 decks +43% synergy
Phyrexian Altar
44% of 16 decks +40% synergy
Reito Lantern
38% of 16 decks +37% synergy
Crystal Ball
31% of 16 decks +31% synergy
Teferi's Puzzle Box
31% of 16 decks +30% synergy
Panharmonicon
31% of 16 decks +27% synergy
Darksteel Pendant
25% of 16 decks +25% synergy
Illusionist's Bracers
25% of 16 decks +24% synergy
Lightning Greaves
25% of 16 decks -0% synergy
Swiftfoot Boots
25% of 16 decks -3% synergy
Desecrated Tomb
19% of 16 decks +18% synergy
Ruby Medallion
19% of 16 decks +16% synergy
Altar of Dementia
19% of 16 decks +16% synergy
Helm of the Host
19% of 16 decks +15% synergy
Enchantments
Goblin Bombardment
50% of 16 decks +47% synergy
Black Market
36% of 11 decks +34% synergy
Braid of Fire
31% of 16 decks +31% synergy
Mana Echoes
25% of 16 decks +24% synergy
Warstorm Surge
19% of 16 decks +16% synergy
Utility Lands
Buried Ruin
38% of 16 decks +32% synergy
Urborg, Tomb of Yawgmoth
38% of 16 decks +27% synergy
Cabal Coffers
27% of 11 decks +22% synergy
Bojuka Bog
27% of 11 decks +12% synergy
Zhalfirin Void
25% of 16 decks +24% synergy
Inventors' Fair
25% of 16 decks +21% synergy
Spinerock Knoll
19% of 16 decks +17% synergy
Great Furnace
19% of 16 decks +16% synergy
Strip Mine
19% of 16 decks +16% synergy
Mana Artifacts
Sol Ring
100% of 16 decks +15% synergy
Arcane Signet
62% of 16 decks -9% synergy
Thran Turbine
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Fellwar Stone
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Mana Crypt
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Lands
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Blood Crypt
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Dragonskull Summit
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Smoldering Marsh
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Graven Cairns
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Tainted Peak
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Sulfurous Springs
45% of 11 decks +41% synergy
Luxury Suite
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Blightstep Pathway
33% of 9 decks +31% synergy
Foreboding Ruins
27% of 11 decks +24% synergy
City of Brass
19% of 16 decks +11% synergy
Bloodstained Mire
19% of 16 decks +8% synergy
Path of Ancestry
19% of 16 decks -2% synergy
Exotic Orchard
19% of 16 decks -17% synergy