At the beginning of your upkeep, put a +1/+1 counter on enchanted creature.
The creature that gets the +1/+1 counter is the creature enchanted by Forced Adaptation when the ability resolves.
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.
