Annihilator Spellbomb

{x} can be 10 at most.
Put this card face-up under the top 10-{x} cards
in your opponent's deck.
When you draw this card while it is face-up in
your deck, you lose {x} life, mill {x} cards and sacrifice {x} permanents. This effect cannot be countered. Then put this card into its owners
exile pile. If this card would be milled while it is
face-up in a deck, return it to its owners hand.