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"A standard game of Magic involves two or more players who are engaged in a battle acting as powerful wizards, known as Planeswalkers

And while it wont always be worthwhile, and will occasionally hurt your ability to cast spells, I think it more than deserves some attention in Standard

1 Sol Ring

For example, if you control Johann, Apprentice Sorcerer ("Once each turn, you may cast an instant or sorcery spell from the top of your library") and Kellan, Daring Traveler is on top of your library, you can cast Journey On, but not Kellan, Daring Traveler

They pick up a card on the opposite side and move it to yours

If youre interested, you can find more information about some of the weirder interactions it can cause in this article