Amulet of the Reborn Dead

Equipped creature has Deathtouch and "When
this creature dies, amass X where X is this
creature's power. This ability can't be countered
or prevented."
As long as this artifact is not attached to a
creature, it has "Sacrifice an Army you control:
Create X 2/2 Zombie Merfolk creature tokens
where X is equal to the sacrificed creature's
toughness." and "{p/b}{p/b}{p/b}{p/b}: Return
this card to your hand from your graveyard or
exile." and "Equip {3}"