Infinite +1/+1 counters on a creature, Infinite ETB, Infinite LTB, Infinite Mutagen tokens, Infinite death triggers, Infinite sacrifice triggers, Infinite storm count
Cast Metalwork Colossus by paying , which enters with at least two +1/+1 counters on it due to Arwen.
Activate Arcbound Ravager 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 Arcbound Ravager 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 Arwen.
Activate Arcbound Ravager 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 Arcbound Ravager ability.
Activate Metalwork Colossus by sacrificing two Mutagens, returning it from your graveyard to your hand.
Repeat.