we run 12 scrylands back in theros because 12 was the maximum number of lands that come in tapped for a control deck. but in your deck list here, you are running 13 (counting evolving wilds). i don't understand you at all. but aside from that. im planning to build a grixis deck as well in preperation for the coming next set.

You saw my own take on this, and I think that this is great but I would offer the reasons why I used somewhat different cards. I like Magma Jet over Lightning Strike because it allows for some scry, and there is no particular early game threat other than Fleecemane Lion that Lightning Strike hits that Magma Jet does not. Also, why no Prognostic Sphinx? It helps you get what you need much more quickly. Also, I don't know about four Dig Through Time, although you ARE running no other delve cards, so I guess it isn't so bad. Also, perhaps a Empty the Pits on the SB for a control mirror? I hear that there is going to be an all-black boardwipe in the upcoming set, so I am looking to these colors to only get stronger! +1