Basim Ibn Ishaq As a cheap 2-mana creature with a lot of text, Basim Ibn Ishaq makes my brain-hamster start chugging some espresso
For example, if you control both Zell Dincht and Exploration (an enchantment with "You may play an additional land on each of your turns"), you'll be able to play three lands during each of your turns
Vanguard of Brimaz was my, er, mane man in the early iterations of my first deck
Most importantly, giving your demon deck that would otherwise just be heavy on black access to blue is bound to be useful, giving it access to stronger draw spells and counterspells
Most Magic: The Gathering decks would prefer it if cards stayed out of the graveyard
So I took the plunge, downloaded Arena, and got to playing