Draft Priority: lower is better; how quickly a card is picked in comparison to the cards in the rest of the set. A card with a low draft priority means its drafted earlier. For example, the card that has been first pick, windmill-slammed the most will have a Draft Priority of 1. The worst, least drafted card in the set will have a draft priority of 20.
LSV: prerelease rating on a 0-5 scale by Luis-Scott Vargas, one of the best magic players of all time.
Moxie: MetaMox's card ratings for collection management: