Vorseth, The Outcast

Flying, Hexproof, Unblockable
When you cast Vorseth, you may exile target
instant or sorcery card in any graveyard and
copy it. You may cast that copy without paying
its mana cost, except if it has an X in its mana
cost, X is equal to half of the mana spent to cast
Vorseth.
When Vorseth deals combat damage to a player,
you may cast target instant or sorcery card from
that player's graveyard without paying its mana
cost.