Vona, Butcher of Magan
Ixalan — mythic
Legendary Creature — Vampire Knight
Vona, Butcher of Magan rulings:
2017-09-29: Vona's last ability can be activated during any step or phase of your turn, including the combat phase. It's possible to attack with Vona and then activate its ability before blockers are declared. Doing so won't remove Vona from combat.