I can see this card quickly becoming an imbalancer. Unupped, killing it would require a minimum of 2 CC cards since the first CC would make it an 8|8 and the second a 10|10. To OTK it you'd have to save up 30
or
quanta to bolt it or 40
to Siphon it. Most forms of soft CC would only serve to strengthen and delay it. Additionally, you have the creature targeted by shield effects, so would things like Ice Shield, Procrastination, Thorn Shield, Fire Shield, etc. be buffing the creature as well? If so, you could technically Quintessence one of them and still get buffed from shield effects. What about creatures targeting it for attacks from a Gravity Pull spell? Would this gain +2/+2 for every attack against it? That would be near lethal for decks which utilize RoL or low attack quanta producing creatures.
The main problem I see if that far too many mechanics in the game "target" a creature which would make this grow out of control quickly. If it started as a weak creature to give players time to CC it before it grew rapidly that would be one thing, but starting at 6|6 makes it virtually impossible to kill unless you happen to have 2 CC cards for 5 damage already in your hand. When you consider that it's not all that uncommon to be able to play this by turn 3 it becomes an RNG battle where you better hope you drew all your CC early or you have a creature that is essentially immortal on the field. The fact that it's airborne is just icing on the cake making it immune to Wings unless you Web it (which ironically would just buff the creature further).
I just feel this card would be very game-breaking, especially with PU or mitosis.
