Power Slash

Affinity for Celestial (This spells costs {1} less to
cast for each Celestial permanent you control.)
Target creature deals damage equal to its power
to another target creature. If that creature
would die this turn, exile it instead.
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.)