Your commander is always one of the most important cards of the deck and strategy so it is a good idea to try to keep him alive and safe
If you do, the target creature has trample until end of turn even if you no longer control a creature with power 4 or greater later in the turn
Its powerful and efficient, but its uniqueness is what sets it apart from the others
Except, theyre almost making a comeback, albeit slightly rejigged, as the next booster pack type well look at: Beyond Boosters
A big driver of rising prices in previous Commander products are the exclusivity of certain cards (past examples include Flusterstorm, Scavenging Ooze, True-Name Nemesis, the free spell cycle from the Ikoria decks and more), so thats eliminated from these decks