Oh.. MEC = Moving Earth Core, i gotcha.You slam your hand to do MEC and you'd have to concentrate and hold your hands for you to see it through. You don't have the time for the additional handseal required for Hungry Ghost.
Hungry Ghost is def a debuff so you can only add one more boost. Also you can create up to five dragons but two can be retained and controlled for multiple turns. Once you send the other three towards an opponent, they act as mere projectile and can't be recalled.
The dragons act independently so they have some sort of sentience. You can have two drags with same element.
Any other question?
Yeah i thought it'd be way to overpowered if the hungry ghost element in that technique didn't count as a debuff already. Makes sense. Oh okey, so they are becoming regular "techniques" then i see. Can these dragons be caught in a genjutsu if they have some sort of sentience?