Here's my take:
3 Narset, Parter of Veils
4 Teferi, Time Raveler
3 Teferi, Hero of Dominaria
2 Elspeth, Sun's Champion
*Notes- Myth Realized and T3feri make for a very strong starting position. Spell Pierce is pretty great to defend your permanents. Silkwrap is a test but so far it's been quite good. Other lists are appreciated, I don't claim to be any kind of UW master but I'm competent. May as well get some discussion going now, this archetype isn't going anywhere.
Common Game lines for my deck:
*Turn1: Myth Realized > Opt > Spell Pierce (best > worst)
*Turn 2: Search for Azcanta or Silkwrap
*Turn 3: Narset (find an answer) or T3feri bounce a critter
*Turn 4: D. Sphere or Supreme Verdict to stabilize
*Turns 5+ T5feri and Elspeth take over. Azcanta comes online. Castles come online.
After that just do more of everything and its fun.