This card looks fun, and i think it is pretty balanced as well, but i would make the ability cost to get overdrive to 3
, since it it pretty much stronger.
Also, i would consider to make this card a non-dragon card, since currently, there are 12 dragons, one for each element (I don´t count leaf dragon) , and I don't think you should change that with a single card like that.
Aside from that, the synergy with plate armor or blessing or even angels may prove to be funny.
Question: Am i right to asume that this card is like with gravity pull of Armagio (can only target himself)? Or is it like Anubis "Qintessence" (Can target others as well.)
If this card can target any creature, it would be pretty overpowerd, and would need an increase in cost.