Since alternate win conditions are spread across all five MTG colors, the deck needs to be five-color too
Bearded Axe, on the other hand, is made for Dwarf decks
To decks with high degrees of mana rocks and friends like Sol Ring, Voltaic Key, and Grim Monolith to stuff like aggressive decks that dont care about the mana, just the smashing, and use Armageddon to prevent you from answering their quick threats
It easily lends itself to well-established infinite combos, though its clear Shalais doing the heavy lifting in this partnership
Not really, but it'll be a fun story (you can and should do this in Standard by the way)
Letting our commander both attack and potentially first strike down two attackers while on defense is almost criminal