Serathan, Heir of Xerovia

+2: Exile the top card of your library. Serathan deals X damage to any target, where X equals the exiled card's converted mana cost.
-3: Create a token that is a copy of any nonland permanent. If that permanent is a creature, it gains haste until end of turn.
-10: You gain an emblem with, "At the beginning of your upkeep, return up to two cards you own in exile to either your hand or the battlefield."