This is what I've been theory crafting since Sage's Reverie was spoiled. Looks like fun, but I'm not sure how it'll actually play out. Hero of Iroas could be replaced by several different cards, it was originally Auratog.
why Sinister Possession? Your opponent will just chump block your massive creature with first strike with the creature you put it on against
why Sinister Possession? Your opponent will just chump block your massive creature with first strike with the creature you put it on against