Prices from TCGPlayer via Magical Meta
For a color pair that is intent on sacrificing resources to generate card and mana advantage, its one that is also inherently bogged down by needing to sequence cards in a certain way, and keep them on the board, to begin to accrue that value
For example, red is the color least likely to interact with an enchantment
First, it can be cast at instant speed, which is already a big benefit, but it's also a Lesson card
Thanks to having access to black, Golgari has plenty of the best sacrifice outlets that let you do so for free, such as Viscera Seer and Carrion Feeder
It automatically formats everything which is nice, but theres some missing customizability that Magic Set Editor boasts over this site