Requires

Cowardice must be on the battlefield. Mirage Mirror must be on the battlefield. Myr Battlesphere must be in hand. Ashnod's Altar 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 Ashnod's Altar 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