Ancient Tablet

Darkpact 1
Ancient Tablet enters the battlefield tapped.
{4}, {t}, Sacrifice Ancient Tablet: Exile target permanent an opponent owns. That player may pay 10 life. If they do, exile Ancient Tablet and they may play Ancient Tablet while it remains exiled. Otherwise, you may play the other exiled card, spending mana as though it were mana of any type to cast it if is a spell.