It shows you exactly what type of opening hand people kept and puts everyone but your own in-game knowledge in plain sight of the entire table (and you can hide the fact you may have kept a mediocre opener so they cant judge you, ahem)
Chrome Mox, Mox Diamond, Mox Opal, Lotus Petal, Lions Eye Diamond Okay, first of all, 1) Yeah, these are those five Moxes
In fact, Arena is the primary way new players can get into the competitive Magic scene
Especially with the Edgar Markov reprint making it more accessible
Angelic Cub Armored Skyhunter Cat-Owl Dawnwing Marshal Eager Glyphmage Emeritus of Truce Freejam Regent Gaelicat Herald of the Forgotten Honorbound Page Inkling Mascot Kemba's Skyguard Leonin Skyhunter Leori, Sparktouched Hunter Liberated Livestock Lion Vulture Mirri the Cursed Patagia Tiger Pride of the Clouds Skycat Sovereign Skyhunter Cub Skyhunter Patrol Skyhunter Prowler Skyhunter Skirmisher Skyhunter Strike Force Skyknight Squire Skyship Stalker Spirit of the Hearth Tabaxi Toucaneers Territorial Aetherkite Thriving Skyclaw Vadrok, Apex of Thunder Vadrok, Apex of Thunder Vivien's Jaguar Wasitora, Nekoru Queen Windgrace Acolyte