Qi'Aad, Duel Arbiter

Qi'Aad, Duel Arbiter enters the battlefield with
X Abritration Counters on it.
{t}: Exile target spell that wasn't cast from it's
controllers hand, or wasn't cast on its controller's
turn unless its controller pays {x}, where X is
the number of Arbitration counters on Qi'Aad.
"Alright, let's have a nice, fair, magical clash of wills
over the mana rights to this plane!"