Lei-Fae, Tyrant Scourge

0: Create Tyrant's Bane, a legendary equipment token, and equip it to Lei-Fae, Tyrant's Scourge.
+1: Lei-Fae becomes a 1/1 black Assassin creature with deathtouch until end of turn. Prevent all damage that would be dealt to her this turn.
-7: Exile all creatures with power 4 or greater.