Cheapest priced copy (Outlaws of Thunder Junction Commander): $0.35 at Card Kingdom, near mint, their price list as of .
Pteramander 
Creature — Salamander Drake · 1/1 · Uncommon · Ravnica Allegiance · #47
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.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Outlaws of Thunder Junction Commander | 109 | Uncommon | $0.35 | — |
| The List | RNA-47 | Uncommon | $0.35 | — |
| Planeswalker Championship Promos | 2019-1 | Uncommon | — | — |
| Ravnica Allegiance | 47 | Uncommon | $0.35 | $0.79 |
| Ravnica Remastered | 54 | Uncommon | $0.35 | $0.49 |
| Ravnica Remastered | 317 | Uncommon | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 25 January 2019If a creature somehow loses all of its +1/+1 counters, it can adapt again and get more +1/+1 counters.
- 25 January 2019Pteramander's activated ability can't reduce itself to less than {U} to activate.
- 25 January 2019You 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.