Requires

Wick, the Whorled Mind must be in hand. Bartolomé del Presidio must be on the battlefield. Leyline of Transformation must be on the battlefield (with "Rat" chosen). Mana needed:

Steps

1. Cast Wick by paying .
2. When Wick enters the battlefield, it triggers.
3. Holding priority, if you control a Snail, activate Bartolomé del Presidio by sacrificing the Snail, putting a +1/+1 counter on Bartolomé del Presidio.
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 Leyline of Transformation, Wick triggers.
7. Repeat from step 3.

Results