Dark Coffin Cavern (BSS05-106) [Strangers in the Sky]

[LV1][LV2] During Your Attack Step

Each turn, the first spirit you control that attacks gains [Curse] during this turn: While This Spirit Attacks [Curse] (If one of your opponent's spirits blocks, destroy it when the battle 2 ends.)

[LV2] During Your Attack Step

When one of your Undead spirits is destroyed, select one of your opponent's spirits with one core on it and destroy it.