Apothecary Mice

Whenever you gain life, create a 1/1 Mouse
creature token. Creatures you control may
attack their owner. whenever a mouse you
control deals damage to you, gain 2 life.
(after applying the damage.)
Transmute—{w}(When you transmute this
card, shuffle it into your library, then reveal cards
from the top of your library until you reveal a
card that shares a permanent type with the
transmuted card. Put it onto the battlefield.)