GLEAM AND GLOW is the best healing effect in the game by a mile, allowing you to heal 3 damage (from a single character) and draw 3 cards
For Mirror Box, that rule is the legendary rule that says you're only allowed one copy of a legendary creature card on your battlefield at the same time
In the rare cases that Ive seen this card in Commander, its usually been played with something like Nyxbloom Ancient to create a ridiculous amount of mana that almost invariably wins the game on the spot
The set has sold better than anything else that Wizards of the Coast has ever put out for the massively popular card game, and the exposure and merchandising fees that Square is racking up for Final Fantasy must surely be astounding
There's no obvious reason why Hakbal would be difficult to code in, or be less effective in a two-player game
I haven't been following Standard closely since rotation, but I can definitely see this card coming in handy in many matchups due to its versatility