They have a great website and not only are they long-time retailers, they also have tremendous experience putting together conventions related to Magic and Flesh and Blood
GameStop advertises a number of "chase" cards in the pool that people might want, like a $52,000 2003 Umbreon or a $61,232 2006 Mewtwo
Reptilianne Medusa X DARK Level 6 [ Reptile / Effect ] ATK 2200 DEF 800 Send 1 card from your hand to the Graveyard and select 1 face-up monster your opponent controls
Combine this with the general rarity of rainbow cards and Charizard VSTAR becomes well worthy of its spot on this list
Creatures that work well with this artifact include Griselbrand / Emrakul, the Aeons Torn / and Jodah, the Unifier
If another card(s) you control leaves the field by an opponent's card effect, while this card is in your Monster Zone (except during the Damage Step): You can send 1 card on the field to the GY