The objective is to summon Union Carrier with the Simorghs, then you summon them back from the graveyard and make Simorgh, Bird of Sovreignty.
Use Union Carrier to equip Mist Valley Thunderbird to Simorgh, during the end phase summon Ape Avian from the had or deck with Simorgh. Proceed to negate a lot of stuff. Otherwise summon the barrier statue if you think you'll need it more.
With simorgh onslaught, you can get the birds in your hand and in your graveyard. You can either normal summon them (you get extra normal summons with bird of the beginning and the field card) or you can try to get them in the graveyard to use their special summoning effect.
The synchros and xyzs are there for when things go wrong and you either need more cards or to destroy your opponent's stuff. Nahata and unexpected dai help getting them out.
If you manage to succesfully lock your opponent out of his turn you can use borreload, and S39 to finish your opponent, if you need to stall longer summon what's left between Dark Simorgh, the barrier statue and Apex avian.
Possible cheap additions to this deck are anti spell fragrance to combo with Dark Simorgh or Harpie's Feather Storm.
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