As far as I can tell you'll not often have multiple Armies on your side (though it is possible), even though - to me anyway - "Army" smells go-wide rather than go-tall
Izzet Spellementals (10.5% of the Winner's Metagame) 6 Island 4 Riverpyre Verge 4 Spirebluff Canal 4 Steam Vents 4 Eddymurk Crab 4 Hearth Elemental 4 Sunderflock 4 Opt 4 Prismari Charm 4 Sleight of Hand 3 Burst Lightning 2 Get Out 2 Traumatic Critique 2 Spell Snare 2 Impractical Joke 2 Stormcarved Coast 2 Flow State 2 Winternight Stories 1 Spell Pierce 3 Colorstorm Stallion 2 Annul 2 Ghost Vacuum 2 Slagstorm 2 Ral, Crackling Wit 1 Disdainful Stroke 1 Flashfreeze 1 Octopus Form 1 Spell Pierce Izzet Spellementals is built around a high density of cheap instants and sorceries that draw cards, interact early in the game, and stock the graveyard for Eddymurk Crab and Hearth Elemental
(It's a 2/2 black Zombie creature.)
If they do, they choose an opponent to also copy it
Then, I can tap this artifact at any time to put a creature on the battlefield if it has a mana value equal to the number of charge counters on Aether Vial
First, though, youll have to get the ball rolling without opening up any significant opportunities for your opponent to shut you down