While this is less than 10% of a PSA 9 1st Edition Holo-Charizard, this price drop-off is much better than the 86% value drop-off between PSA 10 and PSA 9 versions of the same card
On paper, that is a good strategy because his field spell, Ancient City - Rainbow Ruins, gains increasingly powerful effects for each one, and if the backrow is full can summon a monster from there each turn, and if it happens to be Ruby Carbuncle it will result in a massive advantage
While Mega Charizard X and Mega Gengar are the big names, you'll also be able to nab shiny versions of Dragonair, Ponyta, Pineco, and Zorua
Here's the Command Zone's thoughts on what you can do with him in the format: He's also, potentially, playable in the eternal MTG format Modern