@Dr.Edge kid

I like your list. I'm actually playing the same main deck except of the nether shadows and -1 Golgari thug.
Instead i play four (4) Street wraiths. I came to the conclusion, to cut breakthrough is the thing we should do. The 8 studies should be enough. I just play the street wraith to have the chance to get them in my opening seven. The advantage with street wraith against breakthrough is, that you have a draw spell, that can be exiled for ichorids in the graveyard.
While i'm looking at your list, this could be nice with nether shadows.
If i play with shadows and +1 thug, i think i will play street wraith in the sideboard against surgical exctraction. ( Instead of playing Breakthrough in the board.
Did you already tested your list? If yes, how do you feel with lesser creatures in the grave to get back the shadows?
Then to the sideboard. How is Chain of Vapor a better choice instead of Nature's Claim?
I was already thinking about it, but i don't know what could be better.
Let's compare this two cards:
Nature's Claim:
+ Nature's claim can destroy your opponents hate directly.
- Costs green mana ( bad with coliseum )
+/- Your opponent gets 4 life ( This can be bad in some situation, but shouldn't be a big problem)
Chain of Vapor:
+ Nice against reanimator ( Bounce creatures like Elesh-Norn )
+/- Can also bounce hate, but if you don't have a therapy left, they will play it again ( except of leyline maybe )
- They can sacrifice a land to bounce you DR targets or creatures.
- blue mana ( can be cast with coliseum )
At any rate, i forgot some points! If you want, say me what, i will add it.
There are some advantages and disadvantages with this two cards.
But i think Chain of Vapor is the right answer, IMO. Because you should always have a therapy in your grave.
And the most important thing is, that you can cast it with every land you have.
Please tell me if i'm wrong with my opinion. I am open to any criticism or disagreement.
K1w1