One Who Surpasses the Storm, Thavas

/:&91; a rear-guard], choose up to one of your opponent's rear-guards, and retire it. :At the beginning of your battle phase, if three or more of your rear-guards are , [discard a card from your hand], search your deck for up to one grade 4 card, ride it as , shuffle your deck, and that unit gets +10000/drive +1 until end of turn. At the end of this turn, retire that unit, and ride a grade 3 card from your soul as .