Its an excellent choice, and you can use it alongside the right selection of lands to ramp out something big as well, which is always a nice bonus
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It basically makes decks like the ones built around Prosper, Tome-Bound almost useless
A 1/3 that quests for one lore, the power of Arthur is in his ability, which allows you to return one of your other characters to your hand in order to gain two lore
At three mana, its a little tough to expect to trigger Compy Swarm the turn you cast it without having some ability to reliably bin your own creatures
In Commander, you can draw up to three cards if you attack all your opponents, which is pretty impressive from a 3-mana creature