Shannara, Fate Seer

Whenever you cast a creature spell, you may pay {u}{r}{g}. If you do, create a token creature that's a copy of that creature, it gains haste, exile it at the beginning of your next upkeep.
Shannara's power is equal to half the number of creatures your opponents control, rounded down.
Shannara's toughness is equal to the number of creatures you control, rounded down.