I have been playing Control Slaver for years and now switching over to Tezz since it seems to be my play style and a touch quicker.
I also like Negate, however, with Countersquall out there, I have been throwing around the idea of tossing it in. Same effect with -2 life for a black instead of a colorless. While the loss of life is negligible and in T-1... I have had the capability to throw a black out there in place of the colorless every time. Is it worth it? Obviously a poor choice if you are doing a tri-color build but for UB... would make sense IMO.
I would never ever do that. 2 Life doesn't matter, you win with either infinite turns or an 11/11. You will never cast this card turn 1, whereas one of the biggest incentives to run negate is you can lead Land, Mox, Go and have a counter up. There are literally zero advantages to running that card over Negate in this deck.
Well, in the

build reaperbong mentioned only a mox Jet and a mox Sapphire was used. your lands are 4 deltas, 4 Underground Seas, 4 basics. So... unless you get a basic land with same color Mox you would be fine in the situation you mentioned. I guess my thought process is -- in a build where producing the two colors needed for the card is producible with almost all mana combinations: why wouldn't you run it? Does the difficulty producing a color vs colorless out weigh the chances for the slim victory? I would think definitely run it if you are running Dark Confidants or some other utility/little beat stick. I have found (course this is with my

deck) I was beating on opponents with mox monkeys and the like during control fights... 2-8 additional damage would have won me a few games. Obviously if you are running Tri color or the like it would be a poor choice, or in Reaperbong's meta with the mana hate fetching a basic could pose an issue... of-course you would just fetch the opposing land to your mox. The second drawback would be a lack of ability to play Manadrain on turn one as well if you only have two opposing mana sources. Was just a thought, I will try it out at some point and see how it works.