Six Flowers of Phantasms, Shirayuki

Deck/Hand:This card is also regarded as "Fantasy Petal Storm, Shirayuki". :[Choose one or more cards with the sum of their grades being 3 or greater from your hand, and discard them] When this unit attacks or is attacked, you may pay the cost. If you do, choose one of your opponent's vanguards, and it gets -10000 until end of that battle for each of your units with "Shirayuki" in its card name. (The value may even be negative)