Otis Tyvren

Lifelink, menace
At the beginning of your end step, create a 2/2 black Pirate creature token with menace, then you lose 1 life for each Pirate you control.
At the beginning of your upkeep, if you control three or more Pirates, sacrifice 3 of them. If you do, exile Otis Tyvren, then return him to the battlefield transformed under his owner's control.