Soul's Keep

Tether {3}{b}(When this permanent enters the battlefield from your hand, you may pay {3}{b} to
exile a creature card with a converted mana cost {3} or less from your graveyard.)
{t}, Pay 1 life: Add {b}.
{b}{b}, {t}, Pay 3 life, Exile this permanent:
Return the card tethered to it from the exile zone
to the battlefield under your control. It gains this ability.