Cheapest priced copy (Neon Dynasty Commander): $0.79 at Card Kingdom, near mint, their price list as of .
Kami of Celebration 
Creature — Spirit · 3/3 · Rare · Neon Dynasty Commander · #59
Whenever a modified creature you control attacks, exile the top card of your library. You may play that card this turn. (Equipment, Auras you control, and counters are modifications.)
Whenever you cast a spell from exile, put a +1/+1 counter on target creature you control.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.79 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Neon Dynasty Commander | 20 | Rare | $0.79 | — |
| Neon Dynasty Commander | 59 | Rare | $0.99 | — |
4 rulings from Wizards of the Coast
- 18 February 2022An Aura controlled by an opponent does not cause a creature you control to be modified.
- 18 February 2022You must still pay all costs and follow all normal timing rules to play a card this way. For example, you may play a land this way only during your own main phase while the stack is empty, and only if you have not yet played a land this turn.
- 18 February 2022A 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.
- 18 February 2022A creature that is equipped is considered modified no matter who controls the Equipment that's attached to it.