The creature that gets the +1/+1 counter is the creature enchanted by Forced Adaptation when the ability resolves.
24-01-2013
wotc
If Forced Adaptation’s ability triggers but Forced Adaptation isn’t on the battlefield when the ability resolves, put a +1/+1 counter on the creature it was enchanting when it left the battlefield.
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.