First, let’s be clear. A “master set” is different from a standard set.
A Standard Set means collecting one of each card in the main numbered list (e.g., cards 1 through 94).
A Master Set means collecting one of every single card and every single variant. This includes all standard cards, all reverse holos, and all secret rares.
 
For Phantasmal Flames, this means,
Every standard card (Common, Uncommon, Rare)
Every reverse holo version of those cards
Every standard holo rare
All Ultra Rares, Full Arts, and Alternate Arts
All Secret Rares
Any included promo cards
Full master set including promos and all rares all in mint condition, all sleeved in a vaultx Binder, all in order.  
 
Very low stock