So, as WoTC states, you will always get a rare or mythic rare in a regular booster pack, but if you find yourself in a mass market store and only have a couple of bucks to spend on scratching your Magic itch, you now have this as an option.
As a result, this Radiant Charizard suffers from the same ailments as its other versions of the Sword/Shield block, such as the Charizard V CPA 79 and Charizard VMAX SHF SV107
Doing so should give the player access to all meaningful interactions on their endboard: "Gustav Rocket" (with "Goliath" attached), "Superior Dora" (with "Derricrane" attached), "Regulus", 2-4 draws, and "Citadel" either on the field or in the GY
You can craft any card so long as you have the necessary Crafting Points, and the deck builder menu which you can access at any time just by choosing to edit your deck lists every card in the game
I would say theyre optional unless were in a format where Loading