I've tried Pious Evangel and to me it seems like it would fit better in a WB or Crats version of the deck rather than a WU version. You don't really have anything in WU to take advantage of the lifegain or sacrifice effects, except to flip your 1-of Avacyn.
I like the deck concept, DJ, though I worry that Goma Fada + Displacer comes in too late to be effective sweeper protection. It looks pretty aggressive; I was thinking of trying WG for an aggro humans deck, but WU looks powerful as well.
I went a bit more midrange for my UW tempo deck:
5 x
Plains5 x
Island2 x
Prairie Stream2 x
Glacial Fortress3 x
Meandering River4 x
Crumbling Vestige2 x
Westvale Abbey2 x
Foundry of the Consuls3 x
Essence Flux - Removal defense, combo with several ETB creatures
2 x
Hanweir Militia Captain - Early attacker/blocker, Combo with Whirler, Skyspawner, Abbey
2 x
Dimensional Infiltrator - Early flier with modest upside
2 x
Dauntless River Marshal - Early attacker/blocker, utility ability later on
1 x
Jace, Vryn's Prodigy - Looting, recursion
3 x
Disperse - Bounce, removal defense, combo with several ETB creatures
2 x
Declaration in Stone - Spot removal
2 x
Eldrazi Displacer - Removal defense, combo with several ETB creatures
4 x
Eldrazi Skyspawner - Ramp, combo enabler, flier, source of colourless
3 x
Reflector Mage - Bounce
2 x
Make A Stand - Sweeper protection, finisher
3 x
Whirler Rogue - Sweep recovery, combo with Hanweir, Reality Smasher, Abbey
2 x
Thought-Knot Seer - Sweep/removal/threat protection
1 x
Gideon, Ally of Zendikar - General goodstuff
1 x
Archangel Avacyn - Sweep protection, finisher
2 x
Reality Smasher - Combo with Whirler, Skyspawner
1 x
Jace, Unraveler of Secrets - Draw, bounce
Yes, it has 61 cards because I wanted an extra mana. Anyone who doesn't like that can figure out which card to cut themselves.
There are several other cards that are arguably a good fit:
- I tried Roil Spout in place of Disperse (combo with Dimensional Infiltrator) but didn't like the extra mana cost and lack of utility on my own creatures; Clutch of Currents would be better but is still only sorcery speed. On the other hand, Just the Wind could be a possibility; I have only Jace for looting so madness doesn't come up much, but if man-lands are more of issue than enchantments or the like, then Just the Wind can hit them where Disperse can't.
- Make A Stand is a general purpose card that is good at several things but not exceptional at any of them. Scatter to the Winds would be a better anti-sweeper spell. Thalia's Lieutenant (abuse ETB effects) or Always Watching would be a better general purpose pump. The versatility is useful if you don't know exactly what you'll need, but I consider this slot to be tunable if I am anticipating a particular kind of threat.