Music of Smiles Misaki Okusawa SSP (BD/W73-E004SSP SSP) BanG Dream! Vol.2 Card details

[CONT] If there is a marker underneath this card, this card gets +7000 power and the following ability. "[AUTO] [(1)] At the beginning of your opponent's attack phase, you may pay the cost. If you do, choose 1 of your "Hello, Happy World!" characters and this card, and exchange them as [STAND]."
[AUTO] When this card is placed on the stage from your hand or by the [AUTO] effect of ""Music of Smiles" Kokoro Tsurumaki", you may put the top card of your clock into your waiting room, choose up to 1 character in your waiting room with "Kokoro" in its card name, and put it face up underneath this card as a marker.