Ancient Skypalace

This Artifact is only active while you control a
Cleric Creature. Once per round, you may pay
{x}; increase all of your Creatures Resistance by
10% {x}. The first time a Creature you control
is killed while you control a Cleric, roll a die;
if the result is even, that Creature instead
remains on the field with 50 % of its maximum
HP.