Gollum, Obsessive Sneak

Skulk (This creature can't be blocked by creatures with greater power.)
Gollum, Obsessive Sneak can't be blocked by more than one creature.
Whenever Gollum deals combat damage to a player, exile the top card of their library. You may cast spells exiled in this way, and you may spend mana as if it were mana of any color to cast them.