Aurelius, Zealous Gladiator

Finishing Strike (This creature assigns both regular and Last Strike damage)
Whenever a creature enters the battlefield under your control, you may clash with an opponent. If you win the clash, target creature gains Haste and Double Strike until end of turn. (Each clashing player reveals the top card of his or her library, then puts that card on the top or bottom. A player wins if his or her card had a higher converted mana cost.)