Insidious Explosion

Choose any target. Reveal cards from the top of your library until you reveal a nonland card. Erratic Explosion deals damage equal to that card's mana value to that permanent or player. Put the revealed cards on the bottom of your library in any order.

As an additional cost to cast this spell, discard X cards. Search your library for X cards, then shuffle and put those cards on top in any order.

You choose all targets for all spells and abilities.