Stregoneria
Metti un segnalino +1/+1 su una creatura bersaglio che controlli. Poi quella creatura infligge danno pari alla sua forza a una creatura bersaglio controllata da un avversario.
As Felling Blow tries to resolve, if either creature is an illegal target, the creature you control won't deal damage. If the creature you control is a legal target but the other creature isn't, your creature will still get a +1/+1 counter.
You can't cast Felling Blow unless you choose a creature you control and a creature an opponent controls as targets.