Goblegorp, Sneakiest of Sneaks

Sneak (If you draw this card, you may place it onto the battlefield face down as a 1/1 creature with unblockable and "Whenever this creature deals damage to a player, put a Sneak Counter on it." You may turn it face up whenever it deals combat damage
to a player.)
When Goblegorp, Sneakiest of Sneaks is turned face up, destroy each nonland permanent with converted mana cost equal to the number of Sneak Counters on h