Ancient Adamantoise + Nim Deathmantle + Krark-Clan Ironworks + Grimgrin, Corpse-Born
Ancient Adamantoise
Nim Deathmantle
Krark-Clan Ironworks
Grimgrin, Corpse-Born
Infinite +1/+1 counters on a creatureInfinite artifact ETBInfinite artifact tokensInfinite colorless manaInfinite creature ETBInfinite creature LTBInfinite creature sacrifice triggersInfinite death triggersInfinite tapped Treasure tokens
How it works
Activate Grimgrin by sacrificing Ancient Adamantoise.
When Ancient Adamantoise dies, it and Nim Deathmantle trigger.
Resolve the Nim Deathmantle trigger, causing you to pay 4 to return Ancient Adamantoise from your graveyard to the battlefield and attach Nim Deathmantle to it.
Resolve the Ancient Adamantoise trigger, creating ten tapped Treasure tokens.
Resolve the Grimgrin ability.
Activate Krark-Clan Ironworks twice by sacrificing two Treasures, adding CCCC.