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Grinding Station does this with a variety of combo pieces, some of which youd likely already have in a deck

Even enchanting or equipping Giant Slug does not make this efficient

It's great for landfall decks that constantly throw lands out, and it's great for slower decks that just need to ensure they get some kind of ramp each turn

Putting all the necessary effort into a spell just to see it fail has never happened in Naya

Put the rest on the bottom of your library in a random order." On top of that, it also costs one less mana to cast for each artifact you control, which means it could be as low as two mana if you've got enough artifacts in play