Tengai Shinsei

•Untap all of your lands. This spell cannot be countered
•Deal 10 Damage to each opponent, opponent's
creature, planeswalker and destroy 10 of their
lands.
•Overload {15}{r}{r}(You may cast this spell for
its overload cost. If you do, put this card back in
your hand)
Well then...what will you do about the second one?