Emperor Dragon, Gaia Emperor
All rear-guards with equip gauge get +5000 Power! If your opponent's vanguard is grade 3 or greater, they get +10000 Power instead of +5000!
Also, when it attacks, by retiring one rear-guard, this unit gets the original power of the retired unit! If your opponent's vanguard is grade 3 or greater, it gets the original critical as well!
The stronger your opponent's vanguard, the stronger you will be!

Regiment Dragon, Regiodon
When it attacks, you may put an equip gauge on one rear-guard. When this unit is retired from a card's ability, you may call one card from this unit's equip gauge as a rear-guard!
Retire this unit and aim for continuous attacks with the ability of "Emperor Dragon, Gaia Emperor"!