Food Chain

Exile a creature you control: Add X mana of any one color, where X is 1 plus the exiled creature's mana value. Spend this mana only to cast creature spells.

Eternal Scourge

You may cast this card from exile.
When this creature becomes the target of a spell or ability an opponent controls, exile this creature.

Misthollow Griffin

Flying
You may cast this card from exile.

Extract

Search target player's library for a card and exile it. Then that player shuffles.

Squee, the Immortal

You may cast this card from your graveyard or from exile.

Foresight

Search your library for three cards, exile them, then shuffle.
Draw a card at the beginning of the next turn's upkeep.