If you want to hear about tendrils from a pro, go here:
http://www.themanadrain.com/forums/viewtopic.php?t=15006First off, I would like to point out that your manabase seems really unstable. The fetches are unnecessary, and probably end up hurting you as you need access to more than two colors right away. I suggest gemstone and city of brass. Some people like to go with another two glimmervoids, but you could use two undergrounds and not have too much trouble. Also, academy can give a strong boost to the mana. In place of the chrome moxes, I would suggest testing ESG, it has been used for a long time in 10 land stompy, and here we have 11 land storm combo. It is also unrestricted. Crop rotation and fastbond have also seen some popularity recently, which hasn't been the case since academy was good. The ESG's though are like lotus petals, and I think fastbond is better than mox diamond with low land and lots of draw.
There are some cards in your maindeck which seem suboptimal. The hurkyl's + grim monolith, and the second tendrils should be a burning wish. Some testing has been done with three copies of Diminishing returns, with a fourth in the side, and with only two win conditions in the deck it would seem dangerous, but apparently works really well. That may be support of academy, which further supports fastbond and crop rotation. One copy of Returns was used in the side for Long.dec before LED and Burning Wish were canned, along with another of tendrils, artifact kill like primitive justice, and Will. Having the wish makes the deck more flexible. Another tutor option is Death Wish, a card I am more skeptical about but which also has been tested with positive results.
Putting in the FoW and trying to keep the mana sources under 30 will probably squeeze out the spheres, so keep that in mind.
- Machinus