23 Jun 2020
You can't cast Hunter's Edge unless you choose both a creature you control and a creature you don't control as targets.
23 Jun 2020
If either creature is an illegal target as Hunter's Edge tries to resolve, the creature you control won't deal damage.
23 Jun 2020
If the creature you don't control is an illegal target as Hunter's Edge tries to resolve but the creature you control is a legal target, you just put a +1/+1 counter on the creature you control.