Flash - Advent: Dark Snake & Cost 5 or more (Either Attack Step)
By sending your Soul Core to the Trash, stack this from your hand onto your target spirit.
[LV1][LV2][LV3] (When Summoned/Advents) Summon "Dark Snake" family Spirits from your Hand/Trash up to a total of Cost 12, paying one cost for each. You can only use this effect once per turn.
[LV3] (Your Attack Step) When "Dark Snake" family Spirits you control are destroyed by the opponent, send one core from the opposing Life to the Reserve.