Requires

Wick, the Whorled Mind must be in hand, or in the command zone. Carrion Feeder must be on the battlefield. Xenograft must be on the battlefield. Xenograft on the battlefield with "Rat" chosen. Mana needed: plus enough mana to pay for commander tax, if applicable

Steps

1. Cast Wick either from your hand or from the command zone by paying plus commander tax, if applicable.
2. When Wick enters the battlefield, it triggers.
3. Holding priority, if you control a Snail, activate Carrion Feeder by sacrificing the Snail, putting a +1/+1 counter on Carrion Feeder.
4. If needed, repeat step 3 until you do not control a Snail.
5. Resolve the Wick trigger, creating a 1/1 Snail creature token.
6. When the Snail enters the battlefield as a Rat due to Xenograft, Wick triggers.
7. Repeat from step 3.

Results