Supreme Heavenly Emperor Dragon, Dragonic Overlord "the Ace"

(Released when both players' vanguards are grade 3 or greater!)-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. :[ 2 & Choose a face down card named "Supreme Heavenly Emperor Dragon, Dragonic Overlord "the Ace"" from your G zone, and turn it face up] If the number of face up cards in your G zone is two or more, until end of turn, this unit gets drive -1, and ":[Choose a card from your hand, and discard it & Choose a card with "Overlord" in its card name from your hand, and discard it] At the end of the battle that this unit attacked a vanguard, you may pay the cost. If you do, this unit, and it gets +5000 until end of turn. (Even if you do not pay the cost, this ability cannot be used for the rest of that turn.)".