True Life, Verum Vita (Deathdrives)

:You may only have one "True Life, Verum Vita (Deathdrives)" in a deck. (Drop):When your damage check reveals a card other than [Heal] or [Over], if you have a grade 3 vanguard with "(Deathdrives)" in its card name, and your damage zone has five cards, [ride this card], and the number of cards in your damage zone for you to lose becomes seven until end of this fight. (If any damage remains, perform additional damage checks) :When this unit attacks, if your damage zone has six or more cards, 1, and retire all of your and your opponent's rear-guards.