Super Giant of Light, Enigman Crossray

-Stride Step-[Choose one or more cards with the sum of their grades being 3 or greater from your hand, and discard them] this card on your from face down. :[Choose one of your rear-guards, and it] At the beginning of your attack step, if this unit's is 30000 or greater, you may pay the cost. If you do, this unit gets +10000 until end of turn. (Activates for each attack, and its increases if you pay the cost)