Strionic Resonator (Retro) [The Brothers' War Commander] Mini Dragon Set: EX: Hidden Legends Type:

Set: EX: Hidden Legends Type: Grass Rarity: Holo Rare Retreat cost: 0

Whenever Kroxa enters the battlefield or attacks

if [Jesmon] is in this Digimon's digivolution cards or you have a Digimon with [Sistermon] in its name in play

and 10 Common cards

Strionic Resonator (Retro) [The Brothers' War Commander] Mini Dragon Set: EX: Hidden Legends Type:Set: The Brothers' War Commander Type: Artifact Rarity: Rare Cost: {2} {2}, {T}: Copy target triggered ability you control. You may choose new targets for the copy. (A triggered ability uses the words "when," "whenever," or "at.") Nobody knew what the relic did, only that it was growing louder.