Etherium Pteramander
Artifact Creature — Salamander Drake
Flying
This creature can block only creatures with flying.
: Adapt 4. This ability costs 
less to activate for each other artifact you control. (If this creature has no +1/+1 counters on it, put four +1/+1 counters on it.)
Kekai Kotaki
Modern Horizons 3 (MH3)
• #92Rulings
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.
(wotc • 2024-06-07)
If a creature somehow loses all of its +1/+1 counters, it can adapt again and get more +1/+1 counters.
(wotc • 2024-06-07)
Rulings
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.
(wotc • 2024-06-07)
If a creature somehow loses all of its +1/+1 counters, it can adapt again and get more +1/+1 counters.
(wotc • 2024-06-07)