Frostmourne

Pay 1 life or sacrifice a creature to equip Frostmourne to a creature.
When Frostmourne is put on a creature, destroy target creature.
When the creature that has Frostourne on it dies the creature that destroyed it in combat gets Frostmourne.
All creatures the controller of Frostmourne controls have: Tap Frostmourne, return target creature from graveyard to battlefield tapped, the creature is also a Skeleton in addition to all types.