U/W Flash is the top dog in Standard, but you can work off the building blocks of that deck’s design to yield some powerful ways to attack the metagame.
W/B Aggro is remarkably similar to U/W Flash. The current best combination in Standard form the backbone. Smuggler’s Copter and Thraben Inspector have managed to combine to take all 32 out of 32 potential slots in a Grand Prix Top 8 already. While G/B Delirium is a very powerful shell, the Copter-plus-Inspector team is allowing aggro decks to put up great results in a number of different archetypes.
Thraben Inspector is essentially a 1-mana Elvish Visionary. While drawing the card right away would be nice, having a 1-mana play is still much stronger. You don’t need to cash in that card right away in your aggressive deck since you often wouldn’t be using it until later anyways. Smuggler’s Copter is the best card in Standard and has allowed the Inspector to become universally adopted as the top crew member.
Curving into Selfless Spirit, Gideon, Ally of Zendikar, and Archangel Avacyn is a large part of what makes U/W Flash so successful. These are resilient threats that either pump or protect your team. Both Gideon and Avacyn can end the game in a hurry and the answers to them tend to be limited. Most interaction that will help you with an Avacyn will do absolutely nothing against a Gideon, and Avacyn is also excellent at coming down and protecting Gideon from being ambushed.
From there, with the core of those 20 powerful cards, the direction you take the deck is up to you. Spell Queller and Reflector Mage are very strong cards. By choosing to play them, you have some nice tempo elements, but you’re sacrificing being able to play the enemy-color lands. Shambling Vent is a really powerful weapon in a deck with Gideon emblems. Concealed Courtyard just makes casting spells a much easier proposition.
With the relative decline of control decks and Aetherworks Marvel falling completely off the map, Spell Queller and sideboarded countermagic are becoming much less important. Conversely, black sideboard cards like Liliana, the Last Hope and Kalitas, Traitor of Ghet, not to mention Transgress the Mind, are all well positioned.
As for main-deck options, Grasp of Darkness is a top-tier removal spell. The question of whether it should be a 4-of in this deck is only made difficult by the fact that you’ll have to warp your mana base. With a white 1-drop, white 2-drop, and double-white cards at 4 and 5, I wouldn’t want to ever play 10 Swamps.
You do, however, get Anguished Unmaking. Remember when I said it was hard to find spells that deal with both Gideon and Avacyn? Well, Anguished Unmaking is the perfect card for the job. It can also kill a Smuggler’s Copter, a Gearhulk. or a Dynavolt Tower.
Kambal, Consul of Allocation is a pretty exciting weapon against control that will also help you win the race against opposing decks running Smuggler’s Copters and Gideons. A 4-point life swing is pretty massive, and you should cash in on that multiple times per game, if not just the one time when they’re forced to spend a removal spell to deal with the legend.
Ayli, Eternal Pilgrim adds another nice early drop with late-game potential. Ayli can buffer your life total, trade up with bigger creatures, or trigger an Avacyn.
The choice to play W/B vs. U/W comes down to how good Spell Queller and Reflector Mage will be in the metagame going forward. While they’re both extremely powerful cards, part of that value came from people not really expecting these cards to see play with Collected Company rotating out. With the format adapting to U/W, lists will adjust to be better against these 3-drops. If so, W/B could be the next deck to rise to the top!