The black tutorsDemonic Tutor, Vampiric Tutor, and Liliana Vessare the most flexible, while Mystical Tutor and Enlightened Tutor require that your unfair target be a specific type of card
The best way to improve this mana base is by adding more utility lands, as you can sometimes find yourself with lots of mana and nothing to do with it
(When this Equipment enters, create a 2/2 red Rebel creature token, then attach this to it.) Equipped creature gets +2/+2
Gannon dwarfs the competition by offering Azorious recursion at no extra cost no mana, or cards to discard, just the mana to cast the spell
Once you suit up Gyatso with Lightning Greaves, it becomes pretty difficult to permanently remove any of your creatures without a sweeper