hmmm... I actually liked the one that drained quanta when cast. Otherwise this card will pretty much be relegated to speedbow decks since other elements will not be able to keep up due to slower quanta production rates.
Even just a drain of 1 from each element would help.
The new version will be a little too powerful in rainbow decks. All you need is this + fractal in and power w/ quantum and aether pillars and mark. 7 quanta is only high for non-rainbows.
With 2 novas you could field 3 of these in the first round... Three 6|1 creatures on first turn seems a little OP to me. Sure, they break easily but thats still 18 damage on first turn.
Or consider the combo with fractal. It may kill the one it targets, but you still get a bunch back, and powered by quantum pillars, novas, and cremation, you can field them extremely fast.
Without the drain, its just too big of a buff to rainbow rushes.
With the drain, I think it is very cool and unique.
On another note (related tangent), a small drain on casting plus a small activation cost would be a good nerf for SoF and may be a good way to balance other high powered rainbow costs...
I think that the drain on cast mechanic is truly brilliant for balancing and this card makes a great way to show it off.