Hellfire Dragon Emperor, Wirbel K?nig DZ-BT15/SEC01 SEC

[CONT]:During this fight, this card is also regarded as "Hellfire Dragon, Wirbel Dragon", and can only be ridden from a grade 3 card with "Wirbel" in its card name. [CONT](VC):The upper limit of energy you may have from the [CONT] ability of a "Energy Generator" in your crest zone gets +5. [AUTO]:When this unit is placed on (VC), Energy Charge (3). Choose a card with "Hellfire Dragon, Wirbel Dragon" in its original card name from your soul or drop, and this unit gets all of that card's original abilities until end of this fight. [ACT](VC)1/Turn:COST [Energy Blast (10)], retire all of your opponent's rear-guards, and perform one of the following according to the number of cards in your opponent's damage zone. ?Four or less - Choose one of your opponent's vanguards, and deal one damage. ?Five or more - This unit gets [Power]+10000 until end of turn