Some commons are worth money, especially specific foils or older cards that get played in formats like Pauper
Despise, Grim Tutor, and Rise from the Grave is a sweet combination of effects bundled up into one saga
For example, if you control Fated Firepower with two fire counters on it, attack with a 5/5 creature with trample, and your opponent blocks with a 2/2 creature, you can assign 2 damage to the blocker and 3 damage to the defending player
He is a green, yellow, and blue with a power and life of 3 each
When you couple that with some auto equip goodness, a 4/4 reach for four mana is really good deal
The devotion mechanic has a unique and fun play style that you should play around with if you havent yet