You can't cast Nature's Way unless you choose both a creature you control and a creature you don't control as targets.
20-09-2016
wotc
If either target is an illegal target as Nature's Way resolves, no damage will be dealt.
20-09-2016
wotc
Trample only applies to the assignment of combat damage, not the damage Nature's Way has the creature deal.
20-09-2016
wotc
If the creature you don't control is an illegal target as Nature's Way tries to resolve, the creature you control will still gain vigilance and trample.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.