I personally believe in building mtg decks on a budget. And regardless of the direction you wish to take on this deck I need to suggest some cards that you should look into.
Swords to Plowshares x 4 is less than 10 bucks. Important for any white legacy deck. In modern
Path to Exile plays the same roll, but more expensive. Cheaper alternatives for these cards are
condemn and
oust. Having a 1 casting cost creature removal option to stop decks like Infect early on is very important. A couple cheap angels
Serra Avenger Emancipation Angel and
Angel of Jubilation are lower casting cost Angels and highly suggested if you want to run a "Tribal" Angel themed deck.
Seraph Sanctuary is one of the few tribal Angel cards that I can think of.
Angelic Curator Angelic Page and
Sustaining Spirit are some 2 casting cost options.
Adaptive Automaton and
Brass herald are an option when looking into unpopular tribal themes.
Ghostly Prison Luminarch Ascension Glacial Chasm Armageddon Pearl Medallion Nykthos, Shrine to Nyx are some cards to look at just because. But it all depends which Direction you decide to take. Google reanimator decks, and an instant reanimator build to give yourself an Idea of the most popular usage of Angels in the game of Magic. These deck usually they run black cards like
animate dead and
reanimate exhume to put down large creatures by turn 1 or 2. These decks also require intentionally discarding a large creature to the graveyard by using
Entomb or other dicard outlets. White has its own graveyard mechanics with
Breath of Life Resurrection Defy Death and best white discard outlet i can think of is
Tireless Tribe.