Flash - Advent: Red & Cost 6 or more (Either Attack Step)
By sending Soul Core to your Trash, stack this from your hand onto your target spirit.
[LV1][LV2] (When Advents) Destroy 1 opposing spirit with 15000 BP or less. In addition, by discarding 1 pre-Advent card under this Spirit with "Kuuga" in it's name, return your Soul Core from your trash onto this Spirit.
[LV2][LV3] (When Attacks) When only the opposing Spirit is destroyed by BP comparison, send 1 opposing live to the Reserve.