Impassive Firemaw

Dream (When you cast this spell, you may have it
have a dream, if you do, it enters the battlefield tapped.
It doesn't untap until you have taken damage.)
Flying
At the beginning of your end step, if Impassive Firemaw is dreaming, create three Treasure
tokens. (They're artifacts with "{t}, Sacrifice this artifact: Add one mana of any color.")