For starters it's huge and has flash, so you can plop it down as your opponent's creatures are attacking and let it swallow one of them up
The following cards fit the bill: Shadow, Mysterious AssassinShadow, Mysterious Assassin wants to sacrifice nonland permanents, so a mix of recursion and powerful enters the battlefield abilities will make the most of this commanders abilities
You bought only one pack just for kicks and you pull this
Please do bear in mind that a lot of this is purely speculative, and I will not be held responsible for you forking out several hundred pocket clams for Archangels of Thune if they eventually end up in the dollar bin (though lets be honest, theyre a silver bullet in modern Birthing Pod lists so theyll probably retain decent value)
Do you have a preferred creature type youd like to recruit into your Army
Decks that run multiple defender creatures are relatively slow