Purphoros, God of the Forge, skinned as Kefka Palazzo, definitely fits the mold
While they were easy to get, these were only given out for a year at a time when the Pokemon TCG had some of its lowest player counts, making it quite a rare card to come by
Mana Vault left Extended just in time, but don't underestimate the importance of the drawbacks of Vault against Monolith - you have to untap it on your upkeep, and it does damage if you don't
This theory meshes with the comments and demographics of notable top Charizard buyers, but when you get to the heart of it, theres just something about Charizards design that has resonated with Pokmon fans and stayed with them throughout the years
Black and white mana offer extensive removal, green and black mana provide consistent value by digging up 'sacked' lands from the graveyard, and white and green mana disrupt opponents to prevent them from achieving their goals