The win conditions of the deck are two fold, and can be switched around if you have full playsets of key cards like Speaker of the Heavens.  
First utilize Daxos and Anointed Chorister+Alsied/Light of Hope and your Radiant Fountains to rush to 27 life.  Utilize combinations of targeted removal and board wipes if necessary to protect your life total until you can get both a Lithoform in play and at least 5 mana open.  Utilize the Lithoform to copy your Speaker as you play them, and on following turns to copy their ability to spawn angels. 
The alternative win condition is to rely on the token generation aspect of the deck with cards like Attended Healer, Omen of the Sun, and Castle Ardenvale.  Utilize the wipes and targeted removals to control the board protect your important creatures from your own board wipes or your opponents removal/attacks with Alsied+Selfless Savior.  Once again the Lithoform can be of great use here to double the number of creatures your Alsied and Selfless Savior can protect on sacrafice, or double spells like Banishing light/Nahiri's Bindings or Swift Response. Focus on maximising value and flooding the field with 1/1's until you can drop your Harmionious Archon turning all creatures on the field to 3/3's. Creatures with counters retain their counters, so focus on creatures with counters for your targeted removal, or those who have troublesome abilities.  Overwhlem your opponent with shear numbers.  Just remember, if you do play your Archon, Inspiring Commander becomes a nearly useless 3/3 as all creature you play will come into play with a power greater than 2 due to the effects of Harmionious Archon (Feel free to switch up the Inspiring Commanders for more Victories Envoys, or Speaker of the Heaven's or even more Archons, I just lack play sets of these creatures.) 
(also, trading a few cards around to fill out the Alsieds and Selfless Saviors to at least 3x if not a full play set would probably be better as well, though the Anointed Chorister's ability to grant it'self +3/+3 until end of turn can be clutch once the Archon is successfully in play.)