Wild Tusk Devastator

Ravage(All creatures able to block this creature do so.)
Devastate - Whenever a creature blocks Wild Tusk Devastator, add {r} or {g} to your mana pool. This mana doesn't empty from your mana pool as steps and fazes end.
Dinosaurs you cast cost {1} less to cast for each creature that has blocked Wild Tusk Devastator this turn.