Extort is the very best identified instance of a Magic: the Gathering mechanic which has colored mana in its reminder textual content:

702.101a Extort is a triggered skill. “Extort” means “Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain life equal to the total life lost this way.”

As the colored mana is solely within the reminder textual content, this doesn’t have an effect on the color id of the cardboard, that means playing cards with extort can be utilized in Commander decks the place the Commander doesn’t have a color id together with black and white.

What different mechanics (if any) exist with colored mana within the reminder textual content?