This happens because my attacking creature has to deal lethal damage to each blocker before damaging the next one
Commander is often referred to as the face of Magic: The Gathering for several reasons, like the sales of Commander products, how engaged fans are with the format, the fact that it's a multiplayer setting rather than the usual 1v1 scenario, and the fact that it can be relatively easy to get into with precon decks
Army of One is all about the Stagger mechanic, teeing your foes up for double damage while also offering lifelink, first strike, and trample in a three-cost card
Lastly, cards like Bident of Thassa trigger from combat damage to players, and a flyer deck has a good shot of getting something through unblocked, even if its small
There's a good engine, as well as enough cards that are individually powerful enough to make things work when it's not coming together