Cheapest priced copy (Throne of Eldraine): $0.35 at Card Kingdom, near mint, their price list as of .
Brimstone Trebuchet 
Artifact Creature — Wall · 1/3 · Common · Throne of Eldraine · #116
Defender, reach
{T}: This creature deals 1 damage to each opponent.
Whenever a Knight you control enters, untap this creature.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Throne of Eldraine | 116 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 4 October 2019In a Two-Headed Giant game, Brimstone Trebuchet's activated ability causes it to deal 1 damage twice.
- 4 October 2019If more than one Knight enters the battlefield under your control at once, Brimstone Trebuchet's last ability triggers for each of them. Players may take actions, such as activating its activated ability, in between each of those triggered abilities resolving.