Iona is a 7/7 Legendary Creature with Flying, and when she enters the battlefield, you choose a color, preventing your opponents from casting any permanent spells of that color
On top of that, you also have access to plenty of card draw effects should you need to trigger Sphinxs Tutelage again
Im inclined to think that the grindier decks are more likely to do better in the long run, though, since the faster decks seem likely to get brickwalled by cards like Penumbra Spidera theme that well see come up again
The three-drop flex slot options in Humans are plentiful as it stands, so this card has to be quite a bit more special than the other options like Militia Bugler
(2024-11-08) To determine the total cost of a spell, start with the mana cost or alternative cost (such as a flashback cost) you're paying, add any cost increases, then apply any cost reductions