When your commander is capable of drawing cards for you, this limits the need to include multiple sources of card advantage in your deck
Humility (T1, S, Block) Because of rules issues, this card should never have seen print
If they die, get exiled or anything else that removes them from the board, you can instead put them back in the Command Zone, but you have to pay two more mana to cast them - and that cost goes up every time
Another advantage this card has is that you can actually create copies that keep bringing spells back without having to sacrifice any of them to the legend rule since its not a legendary
As a 2/1 first strike creature for two mana, it's not the worst in combat, but it's ability is what really makes the card
Draw decks are some of my favorite types in Commander, with Kwain, Itinerant Meddler easily being my favorite deck to play