I also added the mana pool emptying to it, based on @Zaga's
Curiously, both of the recent Final Fantasy flavored price spikes have been for decades-old cards

(Enchanted Djinn) - Blue - x2 056 - Edit parfaitement diabolique (Perfectly Diabolical Edit) - Black - x1 064 - Faveur de Lat-Nam (Lat-Nam's Boon) - Blue - x4 070 - Fouineur des Bas-Fonds (Snooper of the Lower Depths) - Multicolor - x1 076 - Horreur Noire (Black Horror) - Black - x2 079 - Hydre changeante (Changing Hydra) - Red - x2 084 - La Maison Dieu (The House God) - White - x2 093 - Monteur Elfe (Elvish Rider) - Green - x3 098 - N?cr?ne - Blue - x3 106 - Portail sylvestre (Sylvan Portal) - Green - x1 107 - Port Mexicain (Mexican Port) - Land - x1 111 - Reivilo Reinraw - Multicolor - x1 117 - Signe des Anciens (Sign of the Elders) - x2 TO BE REVERIFIED 125 - Tribunal marin (Marine Court) - Blue - x2 126 - Trop de mana, crise de foie (Too much mana, upset stomach) - Red - x2 133 - Yrreiht Timhcs - Multicolor - x1 Alpha Test Prints of cards that didn't make it in the set (25 in Existence): Alpha Test Prints irregular with capitalization error, no circumflex accent, different mana cost, text (10 in Existence): 063 - Lapis-Lazuli (Lapis-Lazuli) - White - Different text - x1 064 - Le grande march

My favorites, personally, were Arcanine EX and Gyarados EX holo full arts
These can be purchased as single packs or in Booster boxes but it should be noted that Aetherdrifts Play Booster boxes have cut their contents down from 36 to 30 packs
The buyers who werent turned off by a $900 price tag are probably more excited by a $1000 price tag, since it demonstrates the card still has room to grow