Wick, the Whorled Mind | Shilgengar, Sire of Famine | Leyline of Transformation

Cards

Wick in hand or in the command zone.
Shilgengar and
Leyline of Transformation on the battlefield (
Leyline of Transformation 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
Shilgengar by sacrificing the Snail, creating a Blood token.
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
Leyline of Transformation,
Wick triggers.
Repeat from step 3.