Wick, the Whorled Mind | Arcane Adaptation | Yahenni, Undying Partisan

Cards

Wick in hand or in the command zone.
Arcane Adaptation and
Yahenni on the battlefield.
Arcane Adaptation on the battlefield with "Rat" chosen.
({3} magic symbol) ({B} magic symbol) plus enough mana to pay for commander tax, if applicable available.

Cast
Wick either from your hand or from the command zone by paying ({3} magic symbol) ({B} magic symbol) plus commander tax, if applicable.
When
Wick enters the battlefield, it triggers.
Holding priority, if you control a Snail, activate
Yahenni by sacrificing the Snail.
If needed, repeat step 3 until you do not control a Snail.
Resolve the
Wick trigger, creating a 1/1 Snail creature token.
When the Snail enters the battlefield as a Rat due to
Arcane Adaptation,
Wick triggers.
Repeat from step 3.