Spellblade Pursuer

Whenever you cast a spell, you may exile it. If you do, Spellblade Pursuer gets +X/+X until end of turn, where X is that spell's converted mana cost. (Remove that spell from the stack. It doesn't trigger any abilities.)
{u}: Spellblade Pursuer gets +1/-1 or -1/+1 until end of turn.