Destruction Tyrant, Fullblade Rex (G-BT10/030EN) [Raging Clash of the Blade Fangs]

[Stride]-Stride Step-[Choose one or more cards with the sum of their grades being 3 or greater from your hand, and discard them] Stride this card on your (VC) from face down. [AUTO](VC):[Soul Blast (1) & Choose one of your rear-guards, and retire it] At the end of the battle that this unit attacked a vanguard, if you have a heart card with "Rex" in its card name, you may pay the cost. If you do, choose a card from your bind zone, call it to (RC), and that unit gets [Power]+4000 until end of turn.