[LV1][LV2]
(During the Battle Phase) Each time your opponent plays a spell with a printed cost of 4 in the Flash Step, move 4 cores from the cards they control and/or their Reserve to their Trash.
[LV2]
(During the Battle Phase) Each time your opponent plays a spell with a printed cost of 3 in the Flash Step, move 3 cores from the cards they control and/or their Reserve to their Trash.