Radiant Vouirescence (BLVO-EN031) [Blazing Vortex]

When this card is Normal Summoned while your opponent controls a monster: You can discard 1 card; send any number of "Radiant Vouirescence" from your Deck to the GY. Once per turn, if this card is in your GY: You can make this card in the GY become DARK until the end of this turn.