Stoned Vampire of the Tub

Vamps gonna vamp — Each oppent sacrafices a creature at each upkeep. For each opponent who
can't, you create a 0/1 green herb creature token
with haste and {t}: Add a {g}.
Bat herb — At the begining of combat, forests
you control are 1/1 black bat tokens with lifelink,
flying, and vigilance that are still lands.

Dead in the water — Bats get +1/+1 for each
island in play.