Angelic Cub

Whenever this creature becomes the target of a spell or ability for the first time each turn, put a +1/+1 counter on it. As long as this creature has three or more +1/+1 counters on it, it has flying.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6obhed7swjpb1h99kijfes.