I dropped 3 copies of Elvish Spirit Guide, Sol Ring, and Thallid Shell Dweller, adding 4 copies of Thorn Thallid and 1 of Tinder Wall. I wanted to be able to hit harder and felt there was more than ample mana remaining. The resulting 10/10/12/4/2/1 curve averages 2.51, which is only slightly higher than the original's 2.49. I do not, however, feel this is a measurable improvement.