Cheapest priced copy (Bloomburrow Commander): $0.69 at Card Kingdom, near mint, their price list as of .
Echoing Assault 
Enchantment · Rare · Bloomburrow Commander · #58
Creature tokens you control have menace.
Whenever you attack a player, choose target nontoken creature that's attacking that player. Create a token that's a copy of that creature, except it's 1/1. The token enters tapped and attacking that player. Sacrifice it at the beginning of the next end step.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.69 to $1.29 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Bloomburrow Commander | 24 | Rare | $0.69 | — |
| Bloomburrow Commander | 58 | Rare | $1.29 | — |
5 rulings from Wizards of the Coast
- 26 July 2024Although the token enters attacking, it was never declared as an attacking creature. Abilities that trigger whenever a creature attacks won't trigger when that creature enters attacking.
- 26 July 2024The token copies exactly what was printed on the original creature and nothing else, except it's a 1/1 (unless that creature is copying something else; see below). It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its types, color, or so on.
- 26 July 2024If you attack multiple players in the same declare attackers step, Echoing Assault's last ability triggers once for each player you attacked.
- 26 July 2024In the case where the target creature is copying something else when Echoing Assault's second ability resolves, then the token enters as whatever that creature copied, except it's a 1/1.
- 26 July 2024Any "enters" abilities of the copied creature will trigger when the token enters. Any "as [this creature] enters" or "[this creature] enters with" abilities of the copied creature will also work.