That's especially true, given both cards had the same perfect PSA 10 grading, both have a similar, vanishingly small population of PSA graded cards, and both were the only PSA 10 copy known to be in existence at the time of sale
Thats less than $50 a deck, despite three out of four costing more than that when bought separately
Its ability dares players to jam as many copies of this card into their deck as they can, which inflates the demand for this card over similarly popular cards that are limited to four copies per deck (or one in Commander)
Tier 3 : These decks remain relevant in the meta and can achieve occasional wins, even against higher tiers
Since Mega Evolution was introduced in Gen 6, its also thematically fitting that Mega Brave [M1L] and Mega Symphonia [M1S] come directly after Gen 5 nostalgia-filled dual set Black Bolt [SV11B] and White Flare [SV11W]
Today, grading is mainstream