Sidequest: Hunt the Mark

When this enchantment enters, destroy up to one target creature.
At the beginning of your end step, if a creature died under an opponent's control this turn, create a Treasure token. Then if you control three or more Treasures, transform this enchantment.

Legend says it is an Anima, guardian to a sacred blade. Though most sacred amongst its kind, its great power drove it to madness, and in the end, it became a threat to its own creator.

Yiazmat, Ultimate Mark

{1}{B}, Sacrifice another creature or artifact: Yiazmat gains indestructible until end of turn. Tap it.

Sidequest: Hunt the Mark / Yiazmat, Ultimate Mark