Kog'maw, the Death Cloud

Flying, deathtouch, trample
When Kog'maw, the Death Cloud transforms,
return any number of cards with different
converted mana costs from your graveyard to
your hand.
{u}{b}{g}: Destroy target permanent. Its controller creates a 3/3 green Beast creature token. Draw 2
cards.
At the beginning of your end step, manifest the
top card of your library.