When Astral Dragon enters the battlefield, it and Flameshadow Conjuring trigger.
Resolve the Astral Dragon trigger, creating four token copies of Anointed Procession that are 3/3 Dragon creatures in addition to their other types.
Resolve the Flameshadow Conjuring trigger, causing you to pay to create a total of 32 Astral Dragon tokens with haste.
When the Astral Dragon tokens enter the battlefield, they trigger, creating an extremely large number of Anointed Procession tokens that are 3/3 Dragon creatures in addition to their other types.
This explosive chain reaction begins when you cast Astral Dragon, whose entry triggers both its own token-copying ability and the triggered ability of Flameshadow Conjuring. Thanks to the doubling effect of Anointed Procession, Astral Dragon's initial entry creates an army of enchantment copies rather than just a pair, which in turn exponentially magnifies the output of every subsequent dragon. When Flameshadow Conjuring lets you pay red mana to copy the original dragon, that new token flood triggers again and spirals immediately into an astronomical, near-infinite number of flying 3/3 dragons and token permanents.