This is Monowhite affinity. The two powerhouses this color gives us are Tempered Steel in the main deck and Dispatch in the sideboard.
Tempered Steel is a proactive way to push through damage that doesn't die to Ancient Grudge, which is considered to be Affinity's worst nightmare. Even though the card is still great against this deck, it hurts much less in this build. It makes Creeping Corrosion and Shatterstorm much less devastating since we can untap and attack with 3/3 Nexi if we have Tempered Steel out.
Also, Stony Silence, thought still very much annoying is not nearly as devastating since it doesn't do anything against Tempered Steel.
If this hasn't convinced you yet, the card also makes our creatures immune to Electrolyze and makes it possible to power through Lingering Souls.
What we trade for this kind of resilience and power is a tendency for less explosive starts as opposed to the blue/red version. Also, the WW can be an issue at times but between Springleaf Drum, Glimmervoid, Mox Opal and a basic plains that we can get for Path to Exile, it shouldn't be much of a problem, and once it is in play it's pretty hard to loose.
Dispatch is amazing, it's basically an upgraded Swords to Plowshares, killing Tasigur, the Golden Fang, Siege Rhino, Tarmogoyf, Wurmcoil Engine or a giant Glistener Elf.
I will test this at our local Saturday Modern events and I will post results below.
+1s are appreciated.
Have a nice day.
