Wizwarbble

Flying
Wizwarbble costs {u/b} less to cast for each
unblocked creature that dealt combat damage
this turn.
{u/b}{u/b}{u/b}: Create a 1/1 black Bat creature
token with flying, lifelink, and hexproof. It has
"Whenever this creature deals combat damage
to a player, mill 1." and "Whenever you mill a
creature card, put a +1/+1 counter on this card."