Cheapest priced copy (Dominaria United): $0.39 at Card Kingdom, near mint, their price list as of .
Balmor, Battlemage Captain 
Legendary Creature — Bird Wizard · 1/3 · Uncommon · Foundations · #237
Flying
Whenever you cast an instant or sorcery spell, creatures you control get +1/+0 and gain trample until end of turn.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
5 printings · $0.39 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dominaria United | 196 | Uncommon | $0.39 | $0.49 |
| Dominaria United | 295 | Uncommon | $0.39 | $0.49 |
| Dominaria United | 336 | Uncommon | — | $0.99 |
| Foundations | 237 | Uncommon | $0.39 | $0.49 |
| The List | DMU-196 | Uncommon | — | — |
2 rulings from Wizards of the Coast
- 8 November 2024Balmor's last ability affects only creatures you control at the time it resolves, including Balmor itself. Creatures you begin to control later in the turn or noncreature permanents that become creatures later won't get the bonus.
- 8 November 2024Balmor's last ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack without resolving.