As speculated by TCGplayer, there could be several factors contributing to the card's massive price point, most obviously the fact that's from the recent Twilight Masquerade set which is still relatively new
Magic: The Gathering referenced Final Fantasy 's many Cids by commissioning art for 15 different versions of the card, one for each of the major Cids in the franchise
Value depends heavily on competitive play utility
Yes, this Ishizu support is super flexible, and yes, I can probably guarantee that they will show up again in the future
Mega Scizor EX inflicts 100 DMG for 3x Metal Energy, but if it has moved to the Active Spot from the Bench, it dishes out a mighty impressive 150 DMG
"Makami" is unique in that it can Normal Summon itself without Tributing if you have 6 or more banished cards, which can easily be fulfilled by using cards like "Pot of Desires" and "Gizmek Orochi, the Serpentron Sky Slasher"