Flash - Advent: Ultraman (Either Attack Step)
By sending your Soul Core to the Trash, stack this from your hand onto your target spirit.
[LV1][LV2] (When Advents) You can show your opponent cards from your hand which contain "Seven"/"Zero" in their names, one of each. For each card revealed, put one core from the void to this Spirit.
[During Advent][LV2] (When Attacks) Destroy an opposing Cost 5 or less Spirit.
After you show your cards, they are returned to your hand instead of putting at the Removed From Game Zone.