Cheapest priced copy (Commander Legends: Battle for Baldur's Gate): $0.35 at Card Kingdom, near mint, their price list as of .
Carefree Swinemaster 
Creature — Gnome Ranger · 1/4 · Common · Commander Legends: Battle for Baldur's Gate · #219
Whenever this creature attacks, you may pay {1}{G}. If you do, create a 2/2 green Boar creature token that's tapped and attacking.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends: Battle for Baldur's Gate | 219 | Common | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 10 June 2022You choose which player or planeswalker is being attacked by the Boar token as it enters the battlefield. It doesn't have to be the same player or planeswalker that Carefree Swinemaster is attacking.
- 10 June 2022Although the token created is an attacking creature, it was never declared as an attacking creature. This means that abilities that trigger whenever a creature attacks won't trigger when it enters the battlefield attacking.
- 10 June 2022While resolving Carefree Swinemaster's triggered ability, you can't pay the cost multiple times to create more than one token.