Misthollow Griffin

Flying
You may cast Misthollow Griffin from exile.

Serum Powder

{T}: Add {C}.
Any time you could mulligan and Serum Powder is in your hand, you may exile all the cards from your hand, then draw that many cards. (You can do this in addition to taking mulligans.)

Pull from Eternity

Put target face-up exiled card into its owner's graveyard.

Eternal Scourge

You may cast Eternal Scourge from exile.
When Eternal Scourge becomes the target of a spell or ability an opponent controls, exile Eternal Scourge.

Squee, the Immortal

You may cast Squee, the Immortal from your graveyard or from exile.