Genesis Dragon, Amnesty Messiah D-SS04/018R TDR

(This card cannot be in your main deck) [Stride]-Stride Step-COST [Choose one or more cards with the sum of their grades being 3 or greater from your hand, and discard them], and Stride this card on your (VC) from face down. (When you stride, your original vanguard becomes a heart card, and this unit gets that card's [Power] and card name. At the end of the turn, return this unit face up) [AUTO](VC):When this unit attacks, COST [Counter Blast (1) & turn a card from G zone face up], choose any number of yours and your opponent's locked cards, and unlock them. Choose one of your rear-guards, and it gets [Power]+5000 until end of turn for each card unlocked with this ability.