Chilling Mist

Target creature an opponent controls gets -3/-0
until end of turn. If its power is 0, tap it.
Ash of War (Then you may exile this spell card
encoded on an artifact Equipment you control that
hasn't been encoded. Whenever a creature with that equipment attached to it attacks, its controller may
cast a copy of this card without paying its mana cost.
The copy must target the equipped creature if able.)