Kaya, Bane of the Dead
Legendary Planeswalker — Kaya
Your opponents and permanents your opponents control with hexproof can be the targets of spells and abilities you control as though they didn't have hexproof.
-3
: Exile target creature.
Magali Villeneuve
War of the Spark (WAR)
• #231Rulings
If a spell or ability you control targets an opponent with hexproof or an opponent’s permanent with hexproof, and Kaya leaves the battlefield while that spell or ability is on the stack, that player or permanent becomes an illegal target for that spell or ability. This includes Kaya’s own loyalty ability.
(wotc • 2019-05-03)
Rulings
If a spell or ability you control targets an opponent with hexproof or an opponent’s permanent with hexproof, and Kaya leaves the battlefield while that spell or ability is on the stack, that player or permanent becomes an illegal target for that spell or ability. This includes Kaya’s own loyalty ability.
(wotc • 2019-05-03)