Rhet-Crop Spearmaster [Mystery Booster]

Set: Mystery Booster Type: Creature — Human Warrior Rarity: Common Cost: {2}{W} You may exert Rhet-Crop Spearmaster as it attacks. When you do, it gets +1/+0 and gains first strike until end of turn. (An exerted creature won't untap during your next untap step.) "In the afterlife, I'll have no need of sleep. And until then, I have no time for it!"