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You just have to find a way to get at least two lands into your graveyard
Now, before you think Im getting political, Im only referring to the tendencies of its Magic players
Daretti, Scrap Savant If youre looking to run a mono-red artifact deck, its hard to beat Daretti, Scrap Savant
You can steal a mana rock when you need ramp, a draw piece when youre low on cards, or even an artifact creature when youre behind on board
Beyond that, a good rule of thumb is that you should have a very good reason for adding an extra color to your deck: whether that's gaining access to a card that's particularly powerful, or shoring up a major weakness