But no.
Let's continue torturing Magic: the Gathering!

So, I've more or less reviewed the colors of the cards.
But professionals (and I definitely don't consider myself one) usually don't play with single-color decks, but at least with two-color decks.
Besides, there are many cards, usually strong and rare, that require mana of multiple colors.
Or any of the two/three colors.
Or the color of mana doesn't matter at all, as long as the required amount is available.
The latter (colorless) are usually artifacts, and there are plenty of them in MTG.
These can be simple antiques that quietly sit on the sidelines of the battlefield and, once per turn, usually not for free, provide some bonuses (let's say, mana, or health, or an extra card in hand), or items that can be attached to creatures.
There are also artifact creatures, and there are so many of them that you can assemble quite decent armies from them.