Foundry Masterpiece

Duelist - Whenever a creature you contol kills another during combat and survive, put a Vigil counter on Foundry Masterpiece.
Remove 5 Vigil counters from Foundry Masterpiece : Until end of turn, it becomes a 9/9 Golem Artifact Creature with Lifelink, Reach, Vigilance, and Indestructible.
As long as Foundry Masterpiece is a creature, creatures you control have Indestructible.