Mono White Standard deck strategies recently go with the aggro route, curving from cheap one-drops and two-drops into Gideon and a raided Wingmate Roc. This version I have found though is a midrange-ish version that halts opposing aggro with

Hangarback Walker or Archangel of Tithes and ramping mana with Knight of the White Orchid. The deck can still curve into Gideon and Roc while having solid removals in Stasis Snare and Silkwrap.

Here is the decklist played by MTGO user JohnnyHotSauce who finished Top in the 2015 Magic Online PTQ – 12/13.

Maindeck
2 Archangel of Tithes
2 Dragon Hunter
4 Hangarback Walker
4 Knight of the White Orchid
1 Kytheon, Hero of Akros
4 Mardu Woe-Reaper
2 Wingmate Roc

4 Gideon, Ally of Zendikar
1 Mastery of the Unseen
3 Secure the Wastes
4 Silkwrap
4 Stasis Snare

2 Foundry of the Consuls
23 Plains

Sideboard
1 Archangel of Tithes
3 Hallowed Moonlight
2 Mastery of the Unseen
2 Pacifism
1 Planar Outburst
1 Secure the Wastes
3 Surge of Righteousness
2 Valorous Stance