SolidSnakeUS
Member
♦ = must be colorless mana
(#) or (x) = any mana ("generic mana cost")
If a card asks you to pay ♦, the ♦ has to be paid with colorless mana (which is itself now ♦. If a card has a number in a circle or an X in a circle, it can be paid with mana of any type. The numbers in circles should going forward only appear as a cost which can be paid with any kind of mana.
That is... Super lame. Why add an entire mana type now after 23 years of the game bring around?