Cheapest priced copy (Wilds of Eldraine): $0.35 at Card Kingdom, near mint, their price list as of .
Armory Mice 
Creature — Mouse · 3/1 · Common · Wilds of Eldraine · #3
Celebration — This creature gets +0/+2 as long as two or more nonland permanents entered the battlefield under your control this turn.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Wilds of Eldraine | 3 | Common | $0.35 | $0.49 |
5 rulings from Wizards of the Coast
- 1 September 2023Others are static abilities that give creatures abilities or power and toughness increases as long as two or more nonland permanents entered the battlefield under your control that turn.
- 1 September 2023The permanents that entered the battlefield don't need to remain on the battlefield or under your control. Celebration abilities are checking for past events, not the current game state.
- 1 September 2023Some celebration abilities trigger at specific parts of the turn and check whether two or more nonland permanents entered the battlefield under your control already in that turn.
- 1 September 2023Each celebration ability has a different effect.
- 1 September 2023Celebration abilities only care if two or more nonland permanents entered the battlefield under your control in a turn. They won't get more powerful if more than two permanents entered the battlefield under your control in a turn.