Only mark of time to power eternity seems a bit optimistic. The life bit doesn't seem to be doing much for you either. The dragons seem a bit random.
I'd make time the secondary element and life, if you're dead set on having these elements, mark only (dropping all but the bonds).
If you don't mind changing one of the elements, consider earth/time/darkness. Something like:
Earth -> pillars, graboids, quakes, perhaps a few EA, maybe one or two shields (max two total)
Time -> engines, RTs, eternity (two if you have), maybe hourglasses, maybe one or two shields (max two total)
Darkness -> mark, devourers, a few drain lifes or vamps, maybe one or two shields (max two total)
Try to get as close to 30 cards as you can, for consistency's sake. If you can't, add hourglasses.