Nim Deathmantle + Ashnod's Altar + Ponyback Brigade
Nim Deathmantle
Ashnod's Altar
Ponyback Brigade
Infinite colored manaInfinite creature tokensInfinite death triggersInfinite creature ETBInfinite creature LTBInfinite creature sacrifice triggersInfinite colorless mana
How it works
Activate Ashnod's Altar by sacrificing Ponyback Brigade, adding CC.
Ponyback Brigade dies, triggering Nim Deathmantle, causing you to pay 4 to return Ponyback Brigade from your graveyard to the battlefield, and attach Nim Deathmantle to it.
Ponyback Brigade enters the battlefield, creating three 1/1 Goblin creature tokens.
Activate Ashnod's Altar by sacrificing a Goblin, adding CC.