Secret Within the Student Handbook (5HY/W83-TE26 TD) [The Quintessential Quintuplets]

Brainstorm Flip over 3 cards from the top of your deck, and put them into your waiting room. Choose 1 level X or lower "Quintuplets" character in your waiting room, and return it to your hand. X is equal to the number of "Quintuplets" characters among those cards. Choose 1 of your characters, and that character gets +3000 power until end of turn.