Cheapest priced copy (Masters 25): $0.35 at Card Kingdom, near mint, their price list as of .
Trumpet Blast 
Instant · Common · Core Set 2019 · #165
Attacking creatures get +2/+0 until end of turn.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
10 printings · $0.35 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Masters 25 | 154 | Common | $0.35 | $0.49 |
| Battlebond | 186 | Uncommon | $0.35 | $0.49 |
| Conspiracy: Take the Crown | 172 | Common | $0.35 | $0.49 |
| Conspiracy | 154 | Common | $0.35 | $0.49 |
| Iconic Masters | 151 | Common | $0.35 | $0.49 |
| Khans of Tarkir | 124 | Common | $0.35 | $0.49 |
| Magic 2010 | 160 | Common | $0.35 | $0.49 |
| Magic 2013 | 152 | Common | $0.35 | $0.49 |
| Core Set 2019 | 165 | Common | $0.35 | $0.49 |
| Urza's Destiny | 98 | Common | $0.35 | $2.99 |
3 rulings from Wizards of the Coast
- 1 October 2009An "attacking creature" is one that has been declared as an attacker this combat, or one that was put onto the battlefield attacking this combat. Unless that creature leaves combat, it continues to be an attacking creature through the end of combat step, even if the player it was attacking has left the game, or the planeswalker it was attacking has left combat.
- 1 October 2009Even though Trumpet Blast affects only attacking creatures, the bonus will remain for the rest of the turn.
- 20 September 2014Only creatures that are attacking as Trumpet Blast resolves will receive the bonus. In other words, casting it before you've declared attackers usually won't do anything.