Food Chain

Oracle Text

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

Card Rulings

10/4/2004 This mana may not be used to pay costs imposed after the spell is initially cast.
10/4/2004 This mana may be used on additional costs to cast the spell, such as Kicker.