Monkey D. Luffy

Join My Crew! —Whenever a legendary creature
an opponent controls would die, you may pay {w}{u}{b}{r}{g}. If you do, put it onto the battlefield
under your control instead. It's a Pirate in
addition to its other types.
I Have My Friends! —Pirates you control get
+X/+X, where X is the number of legendary
Pirates you control.
I'm gonna be King of the Pirates!!!