Thieving Melynx

Skulk (This creature can't be blocked by creatures with greater power.)

Whenever Thieving Melynx deals combat damage to a player, exile the top card of their library face down.
Whenever Thieving Melynx leaves the battlefield, you may cast cards exiled with it and spend mana of any color to cast those cards until the end of your next turn. At the end of that turn, shuffle cards not cast this way back into their
owner's libraries.