Thanos, the Mad Titan

Deathtouch, lifelink Power-up — {C}{W}{U}{B}{R}{G}: Put two +1/+1 counters on Thanos. Choose odd or even. Destroy each other creature with mana value of the chosen quality. (Activate each power-up ability only once. Reduce the cost by his mana cost if he entered this turn. Zero is even.)