Veil of Mist

Affinity for Celestial (This spells costs {1} less to
cast for each Celestial permanent you control.)
Tap target creature an opponent controls. That
creature doesn't untap during its controller's
next untap step.
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.)