Wick, the Whorled Mind | Altar of Dementia | Leyline of Transformation

Cards

Wick in hand or in the command zone.
Altar of Dementia 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
Altar of Dementia by sacrificing the Snail, causing target player to mill cards equal to the Snail's power.
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.