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
Many players suggested that pump spells that give +1/+1 counters were worth playing
For example, when Oko, Thief of Crowns was banned in Historic on March 9, 2020, MTGA was updated on March 12, 2020 to include the ban

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