You may cast any number of the copies without paying their mana costs. In essence, whenever you cast a spell, you can cast more spells - and it snowballs
Card x10 Playsheet x1 Rarities Leader Card x 1 Super Rare x 2 Common x 12 *Due to the nature of the product, multiples of one card may appear, or it may be difficult to assemble a full set
You can see the latest banned and restricted lists here
Rumbleweed Rumbleweed needs six lands in your graveyard to have the same mana value as Overrun, and needing only one is much better than , however, the biggest reason Rumbleweed ranks better is the potential to cost less
The one difference is that the change of control was permanent with Eco Shift
Heres a more succinct breakdown: Everything in black and white will ALWAYS be black or white in the actual Dot Code