Cheapest priced copy (Kaldheim): $0.35 at Card Kingdom, near mint, their price list as of .
Frenzied Raider 
Creature — Demon Berserker · 2/2 · Uncommon · Kaldheim · #137
Whenever you activate a boast ability, put a +1/+1 counter on this creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Kaldheim | 137 | Uncommon | $0.35 | $0.49 |
5 rulings from Wizards of the Coast
- 5 February 2021If a creature with a boast ability is put onto the battlefield attacking, it was never declared as an attacker. Its boast ability can't be activated that turn.
- 5 February 2021If it's not your turn and you gain control of a creature with a boast ability after that creature attacked, you can activate that creature's boast ability if it hasn't been activated yet that turn.
- 5 February 2021A boast ability can be activated at any point after the creature with that ability has been declared as an attacker. This can be before blockers are declared, after blockers are declared but before combat damage is dealt, during combat after combat damage is dealt, during the postcombat main phase, during the end step, or, in some unusual cases, during the cleanup step.
- 5 February 2021If an effect adds additional combat phases to a turn and a creature with a boast ability attacks more than once during that turn, its boast ability can still be activated only once.
- 5 February 2021Frenzied Raider's triggered ability will resolve before the boast ability that caused it to trigger.