It is similar to clouding, but with a key difference: while clouding is an internal phenomenon that permanently dulls the cards surface, dirt is external and comes from contact with dirty hands, unclean environments, or greasy/adhesive substances
This mana can't be spent to cast a nonartifact spell
Red deck wins and white weenie are not the best decks because of their raw power or high numbers of broken cards
I have cards divided by general type, in this case by color, and if its a permanent or not
Silverquill, the Disputant Silverquill, the Disputant gives casualty 1 to your instant and sorcery spells, which is pretty powerful, considering that you can sacrifice a token to double any spell effect
Varchild's War-Riders The real winner here is Varchild's War-Riders, which I opened in an Alliances booster