Whisper of the Ravenmother

Target player discards a card. If it is a land card,
add {b}{b} to your mana pool. Otherwise, create a
2/2 black Zombie creature token.
Cipher (Then you may exile this spell card
encoded on a creature you control. Whenever
that creature deals combat damage to a player, its controller may cast a copy of the encoded card
without paying its mana cost.)