(2017-03-14) If you somehow manage to cast Explore when it's not your turn, you'll draw a card when it resolves, but you won't be able to play a land that turn
Shift allows the four cost card to be deployed for only three ink, Evasive makes him difficult to challenge, and Challenger +3 gives him a boost when he's on the attack
Sylvan Library (green, 2 mana): Three cards per turn, with a life-payment trade-off
Cultivate and Skyshroud Claim are more expensive options that provide additional value, all of which are found in abundance in Commander
You can pay one black mana and sacrifice another creature to have a player mill three cards, which is cool, but you can also pay one life to add one colorless mana which can only be used to cast spells from your graveyard