I'm not even sure W/B is the way to go TBH. I think W/U is the shell. Next it depends on the meta. Do you:
- Want to deal with the overabundant aggro decks? Jeskai for earlier removal/faster clocks in Nahiri and Chandra.
- Want to deal with Planeswalker.dec or other Control if they become more common? Esper for Unmaking and better lategame.
- Want to add Green for a reason I can't justify yet? Bant, sure, why not...
W/B to me (and I'm really dissing on Unmaking here) gets chewed up by aggro HARD. I still think you need to be a lifedrain deck to run things like Unmaking/Ob Nix/RTB with all the aggro running around. Blue gives you access to the Catalog/Just The Wind option which has been monumentally consistent for me to stall. Counterspells are still very relevant, and Blue Jace doesn't cost you life like Ob Nix. Hell, even WeCo's Azorius list is a general pain in many decks sides (given how running his Esper list against him last night was "unfun for aggro", I'll stand by that
).
I think the draw-go way is stronger in Jeskai and supports TITI more, but I think something more creature focussed with Kalitas/Ayli could be the way to go in Esper. I'm still trying to think of a way to justify
From Under the Floorboards as a pseudo-Black
Sphinx's Revelation.