Keeper of Sorrow

Flying, aeternal (this creature cannot be the target of instants, sorceries or enchantments)
When Keeper of Sorrow enters the battlefield, each opponent reveals their hand, you may
exile a instant, sorcery or enchantment card from each hand, until the end of your turn you may cast cards exiled this way without paying their mana cost.
It weeps for worlds that may have been.