Flash - ⚞Advent⚟: Imaginary Beast & Cost 2/4 (Either Attack Step)
By sending your Soul Core to the Trash, stack this from your hand onto your target spirit.
[LV1][LV2][LV3] (When Advents) You can summon up to three Cost 2/4 "Imaginary Beast" family Spirit cards from your Hand. For each Spirit summoned by this effect, draw a card.
[During Advent] [LV3] (Your Attack Step) While your "Imaginary Beast" family Spirits are attacking, opposing effects can't end the Attack Step.