Cheapest priced copy (Modern Horizons 3): $0.35 at Card Kingdom, near mint, their price list as of .
Expanding Ooze 
Creature — Ooze · 3/3 · Common · Modern Horizons 3 · #184
{B}{G}: Adapt 1. (If this creature has no +1/+1 counters on it, put a +1/+1 counter on it.)
Whenever this creature attacks, put a +1/+1 counter on target modified creature you control. (Equipment, Auras you control, and counters are modifications.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 3 | 184 | Common | $0.35 | $0.49 |
5 rulings from Wizards of the Coast
- 7 June 2024An Aura controlled by another player does not cause a creature you control to be modified.
- 7 June 2024If a creature somehow loses all of its +1/+1 counters, it can adapt again and get more +1/+1 counters.
- 7 June 2024You 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.
- 7 June 2024A creature that is equipped is considered modified no matter who controls the Equipment that's attached to it.
- 7 June 2024A creature with a counter on it is considered modified no matter what kind of counter it is or which player put it on that creature.