Like most Magic: The Gathering cards, the value of Hildibrand Manderville // Gentleman's Rise depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Final Fantasy Commander)
Like most popular XY-era Megas, it has trended up over the long run as the set ages out of print and Rayquaza demand holds steady
(Tales of Middle-earth was legal in the Modern format, but not Standard.) The Final Fantasy set is a big deal for Magic because it brings Universes Beyond into Standard, helping to usher in Spider-Man and Avatar: The Last Airbender sets later this year that will also be Standard-legal
Its also my 50th article written on SixPrizes, which is kinda cool
(3) If this card is sent to the GY as Link Material: You can add 1 A.I. Trap from your Deck to your hand