There’s wide latitude for what counts as the five colors of mana. Any shade of red qualifies as red, and so on. Some dark shades of purple can likely pass for black mana, and some light shades of yellow can pass for white. We do those on cards sometimes.
07-10-2022
wotc
You can add any color of mana in Un- games, though, so if you really want turquoise mana, go for it.
07-10-2022
wotc
If you’re wearing layers, you can count any garment that other players can see.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.