First off, the deck run 19 land and 61 cards, those are both bad number, I think that 21 is the right amont of land for Dreadstill, you want to hit 3 mana. Add to that the ration of basic vs nonbasic in that build and against a lot of deck you'll end up mana screwed pretty often.

Beside that the idea is interesting, the one thing I dont like is that it spreed the deck pretty thin. One of the strenght of this deck is almost having a plan A and B (either stifle/nought standstill or counter/top) in your hand, maybe a card short but hitting that card isn'nt supposed to be hard since the deck is pretty condensed. Adding the green splash thin the counter package for tarmo wich bring an easy 4 plan for victory but more than that (CoW, Wish) just add more win-con (or dont loose-con) while lowering the reliability of your mains ones.

In other word, for a solution to most problem, you pay with reliability, speed, and a shaky mana base. The idea is good but not whort it IMO, the deck already pack enought win-con/control and disruption as it is, no real need for the wishboard.