Pteramander

Flying
{7}{U}: Adapt 4. This ability costs {1} less to activate for each instant and sorcery card in your graveyard. (If this creature has no +1/+1 counters on it, put four +1/+1 counters on it.)

Outlaws of Thunder Junction Commander

Ravnica Remastered

Flying
{7}{U}: Adapt 4. This ability costs {1} less to activate for each instant and sorcery card in your graveyard.

The List

Planeswalker Championship Promos

If a creature somehow loses all of its +1/+1 counters, it can adapt again and get more +1/+1 counters.

Pteramander's activated ability can't reduce itself to less than {U} to activate.

You can always activate an ability that will cause a creature to adapt. As that ability resolves, if the creature has a +1/+1 counter on it for any reason, you simply won't put any +1/+1 counters on it.