Blue Flight Marshal Dragon, Mythril-core Dragon

-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. Wave-3rd time or more (This ability is active during the specified battles of each turn):When your unit's attack hits a vanguard, if you have a heart card with "Trans-core" in its card name, your opponent may choose a card from his or her hand, and discard it. If he or she does not, draw two cards.