Umori is a case where doing so is the clear best option, letting you easily access its overstatted, cost-reducing goodness without nerfing your deck with a lack of variety in card types
Utility Improvise may only appear on sixteen cards, but three of them provide some very strong utility options
I love it because it allows various strategies, including focusing on growing creatures, setting up the more powerful oil cards, or passively killing someone with poison to flourish
Rakdos Charm is an example of a jack of all trades but a master of none
I already spoke about Anafenza, the Foremost in my intro but the card does deserve mention again
So, perhaps these will be flip cards with the art card on one side and the scene card on the other