[LV1][LV2][LV3] All your "Dark Snake" Spirits get the following effect: "Curse (During Your Battle Phase) Each time this Spirit is blocked, destroy the Spirit that blocked this Spirit at the End of Battle Step."
[LV1][LV2][LV3] (When Destroyed) You can return this Spirit to your hand.
[LV2][LV3] (Your Attack Step) When your Spirits with Curse attack, you can target 1 exhausted opposing Spirit and attack that Spirit.