Preston Garvey, Minuteman: Done harassing you in Fallout 4 to do your chores, Preston is here to give you lots of extra mana with your enchanted lands by untapping them
The precon doesn't have a ton of instants or sorceries so the front side isn't too powerful here, but the back side, Poppet Factory, allows us the ignore the decayed keyword on our zombies
And while Dinglehopper, Gumbo Pot, and Pawpsicle are meant to be discarded, they can also help you heal your characters and maintain control of the board
Black Lotus costing zero mana and tapping for three mana of any one color is such an absurd rate that it gets the number one spot regardless, hence it being banned in Legacy and Restricted in Vintage
When you pair it with other cheap creatures, it can quickly turn a harmless-looking board into a sudden, game-ending swing