Prerequisites
- Rocksteady, Mutant Marauder on the battlefield
- Evolution Witness on the battlefield
- Shifting Wall in hand
Steps
- Cast Shifting Wall by paying
- Shifting Wall enters and dies as a state-based action due to having 0 toughness
- Rocksteady triggers, putting a +1/+1 counter on Evolution Witness
- Evolution Witness triggers, returning Shifting Wall from your graveyard to your hand
- Repeat
Results
Required Cards 3

Rocksteady, Mutant Marauder
Legendary Creature — Rhino Mutant

Evolution Witness
Creature — Elf Shaman Mutant

Shifting Wall
Artifact Creature — Wall