Each creature you tap while casting this spell pays for or one mana of that creature's color.) Destroy target creature or planeswalker
It also requires enough Magic knowledge to know what cards to counterfeit and how best to sell them, which is the real limiting factor
Take a good look at how much of each color you need for each spell and choose your lands accordingly
If you want to go full-blown into mill, switch out some of the counter accelerators like Thrummingbird for cards like Zellix, Sanity Flayer
This will involve setting up an account and paying between 10 and 15 percent in fees, and if you want to sell your cards in a realistic time period, you will need to be among the lowest prices listed
Instead of being just limited to creatures like Karmic Guide, this holy giant can get artifacts, enchantments, and even lands