Requires

Cowardice must be on the battlefield. Mirage Mirror must be on the battlefield. Myr Battlesphere must be in hand. Krark-Clan Ironworks must be on the battlefield. Genesis Chamber must be on the battlefield. Mana needed:

Steps

1. Cast Myr Battlesphere by paying .
2. Myr Battlesphere enters the battlefield, triggering itself and Genesis Chamber.
3. Resolve the Myr Battlesphere trigger, creating four 1/1 Myr artifact creature tokens.
4. Resolve the Genesis Chamber trigger, creating a 1/1 Myr artifact creature token.
5. Activate Krark-Clan Ironworks five times by sacrificing the Myr tokens, adding ten .
6. Activate Mirage Mirror by paying , targeting Myr Battlesphere.
7. Cowardice triggers, returning Myr Battlepshere from the battlefield to your hand.
8. Mirage Mirror's ability fails to resolve due to no longer having a legal target.
9. Repeat.

Results