The range of creatures they care about casts such a wide net that you have a ton of options for building around this commander
There are a lot of powerful cards here with great utility regardless of their fae stylings
The ability that defines Avalanche of Sector 7's power applies in all zones, not just the battlefield

Ifrit Suplex Thunder Magic Triple Triad Unexpected Request Vaan, Street Thief Warrior's Sword Zell Dincht Airship Crash Ancient Adamantoise Balamb T-Rexaur Bard's Bow Bartz and Boko Blitzball Shot Cactuar Chocobo Kick Chocobo Racetrack Clash of the Eikons Coliseum Behemoth Commune with Beavers Diamond Weapon The Earth Crystal Summon: Esper Maduin (Esper Origins // Summon: Esper Maduin) Esper Origins (Esper Origins // Summon: Esper Maduin) Galuf's Final Act Gigantoad Goobbue Gardener Gran Pulse Ochu Gysahl Greens Jumbo Cactuar Loporrit Scout Prishe's Wanderings Quina, Qu Gourmet Reach the Horizon A Realm Reborn Ride the Shoopuf Rydia's Return Sazh Katzroy Sazh's Chocobo Black Chocobo (Sidequest: Raise a Chocobo // Black Chocobo) Sidequest: Raise a Chocobo (Sidequest: Raise a Chocobo // Black Chocobo) Summon: Fat Chocobo Summon: Fenrir Summon: Titan Summoner's Grimoire Tifa Lockhart Tifa's Limit Break Torgal, A Fine Hound Town Greeter Traveling Chocobo Vanille, Cheerful l'Cie Absolute Virtue Balthier and Fran Black Waltz No

Magic is a very complex game though, so make sure to keep posted for future guides on how to play and optimize your Arena experience.
Frontline Heroism is a red enchantment that essentially gives all your creatures a heroic ability