Portal to the Spirit Realm

Cumulative upkeep {p/b}{p/u}
Any player may pay 5 life and gain control of this artifact; if they do not sacrifice a creature with
power and toughness 5 or greater, this card's
owner regains control of this card at end of turn.
{0}: Put target creature from any graveyard or
exile onto the battlefield under your control. Pay
life equal to half of the creature's toughness. If
you do not own the creature, also pay life equal
to half of it's converted mana cost. Round up if
needed.