Infinite ETB, Infinite LTB, Infinite Mutagen tokens, Infinite death triggers, Infinite sacrifice triggers, Infinite storm count, Infinitely large creature until end of turn
Cast Metalwork Colossus by paying , which enters with at least two +1/+1 counters on it due to Bioengineered Future.
Activate Atog by sacrificing Metalwork Colossus.
When Metalwork Colossus dies, The Ooze triggers, creating a Mutagen token for each +1/+1 counter Metalwork Colossus had.
Resolve the Atog ability.
Activate Metalwork Colossus by sacrificing two Mutagens, returning it from your graveyard to your hand.
Repeat.
Component Cards
How It Works
Cast Metalwork Colossus by paying , which enters with at least two +1/+1 counters on it due to Bioengineered Future.
Activate Atog by sacrificing Metalwork Colossus.
When Metalwork Colossus dies, The Ooze triggers, creating a Mutagen token for each +1/+1 counter Metalwork Colossus had.
Resolve the Atog ability.
Activate Metalwork Colossus by sacrificing two Mutagens, returning it from your graveyard to your hand.
Repeat.