Final Fantasy has rather decent artifact support, which means youre effectively getting a 1/4, a 3+/3+, a mana engine, and a mana sink all for one card
Whereas Mind's Eye requires you to use mana to draw cards, the Sphinx draws double those cards for free
Whenever you draw your second card each turn, you'll make a 1/1 blue Illusion token who gets +1/0 for each other Illusion you control
If they guessed wrong, you may cast it without paying its mana cost
The term "ramp" in Magic: The Gathering refers to any spell card that generates a net positive amount of mana, whether that be through floating mana that expires at the end of the phase, lands placed onto your side of the field (though some count searching up lands to put into your hand as ramp as well), or artifacts and cards that create artifacts that can tap for mana
Likely more of a sideboard card and a meta call, but the kind of high upside tool you want in your sideboard arsenal