Interdimensional Dragon, Chronoscommand Dragon

(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 & 1 & Choose a card from your hand, and discard it] When this unit's attack hits a vanguard, you may pay the cost. If you do, your opponent puts all of his or her rear-guards on the bottom of his or her deck.