Katsumi, the Betrayer

Flying, vigilance, protection from black Demons
At the beginning of your upkeep, any opponent may pay 3 life and sacrifice a creature. If a player does, he or she creates a 5/5 black Demon creature token with flying.
Whenever a creature an opponent controls dies, you may tap Katsumi, the Betrayer. If you do, create a 3/3 white Demon creature token with flying and lifelink.