Flash - ⚞Advent⚟: Astral Dragon & Cost 4 or more (Either Attack Step)
By sending your Soul Core(Soul Core) to the Trash, stack this from your hand onto your target spirit.
[LV1][LV2][LV3] (Your Attack Step) All your Astral Dragon spirits can target attack an opposing spirit. When the battle ends, you can add that Astral Dragon Spirit as a pre-Advent card to one of your Spirits that has ⚞Advent⚟.
[During Advent] [LV2][LV3] (Your Attack Step) This spirit is unaffected by opposing effects.