Poison Smoke Hearth

All creatures with flying get -1/-1 until the end
of the turn.
Warding: When a create with flying attacks you.
(You may pay {3} to put this card into play
face down attached to a land. In response to the trigger
condition, you may tap the land and reveal the card.
If you do, play the spell and copy it once. )
Cold-Hearted Witches has their ways of clearing the
sky of nussances, including the spies of their peers.