It grants the equipped creature +2/+2 and protection from both Blue and Black, which stops a lot of targeted removal spells
Square Playing Cards Square cards are used for modern or novelty card games
They give you mana - the games energy - and are played, not cast
Wizards heard the feedback that Breya wasn't the Izzet Artifact commander that everyone wanted, so they took another crack at it and made Jhoira, Weatherlight Captain: she draws you a card each time you cast an artifact and she doesn't have those pesky White/Black colors, huzzah
Six mana to blow up the board and give yourself three tokens is OK, but nothing to write home about
If the game ends, or if you leave a multiplayer game, you need to reveal your face-down permanents to everyone to ensure they came to be face down legally