Food Chain is a mythic Enchantment card from Secret Lair Drop (SLD), collector number 1369. Current market price: $40.10 (foil $47.24), TCGplayer market prices via Scryfall.
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.