Planetary Explosion

Destroy all lands and nonland permanents from the game. It cannot be prevented. If you have 50 or more life, you put all destroyed mana back onto your side of the battlefield.
Planetary Explosion costs 1 less for each card in target player's hand.
"Death is a creative end. From a simple stab wound to the heart to a planet exploding. It never ceases to bedazzle." Yagnar Mastaking.