Demonic Jewel True Dragon, Drajeweled Ignis

:This card can only be ridden from a unit with "Drajeweled" in its card name. :At the beginning of your battle phase, choose two cards from your drop, and put them into soul. Then, if your soul has four or more cards with different grades, all of your front row units get +15000 until end of turn. :While you are paying the cost for this ability, you may cards with "Drajeweled" in their card names from your soul as any grade from 0 to 4. When this unit attacks, [ 5 cards with different grades], retire all of your opponent's back row rear-guards, and until end of turn, this unit gets +1, and increase or decrease all of your opponent's front row units' to 0.