Tartarus

{t}: Add {1} to your mana pool.

{2},{t}: Choose a color. Add to your mana
pool mana an amount of mana equal to your devotion to that color. (Your devotion to a color is the number of mana symbols of that color in the
mana costs of permanents you control.)

"It almost feels like...Brokeback Tartarus?"
-Junpei Iori