I've been enjoying this deck ...
4 Sphinx of Lost Truths
4 Spreading Seas
4 Journey to Nowhere
4 Into the Roil
4 Cancel
4 Rite of Replication
4 Day of Judgment
4 Conqueror's Pledge
13 Island
7 Plains
4 Seijiri Refuge
4 Kabira Crossroads
Sideboard:
4 Devout Lightcaster
4 Kor Sanctifiers
4 Luminarch Ascension
3 Summoner's Bane
But I just got beaten in the mirror in a 2-man queue. Tip #1 - do not Rite of Replication a Sphinx of Lost Truths with kicker when the result is going to be determined by decking.
Luminarch Ascension is an OK plan for boarding in the mirror but with Into the Roil in their deck it's not that great. He conceded really prematurely when I was going to get one online but I only had one white mana and that was definitely a bad concession.
His sideboard plan seemed a lot better. He brought in (at least) one Hedron Crab and four Archive Traps plus Spell Pierce. I also think Hedron Crab + kicked Rite of Replication could be ridiculous (it's ridiculous with a lot of things, including Emeria Angel). Although for this reason the Crab could be a liability against an opponent with Rite.
I'm not really sure if I need the Lightcasters. I seem to beat Vampire as long as I have a Cancel for their Mind Sludge. Even Bloodghast + Carnage Altar just means I need a Journey to Nowhere.
In the main deck Conqueror's Pledge hasn't really been pulling its weight. Everything else has been good.
Could do with some more instant speed removal against Landfall aggro but Into the Roil can work there.
Valakut's super late game can actually be stronger as you have no way to deal with lands entering the battlefield. Countering an early Harrow is pretty sweet though.
In many ways Cancel is the best maindeck card. Perhaps I should run Spell Pierce or Summoner's Bane in the main.
Opinions?