rainbow dash mtg commander deck How To Play The Twilight Sparkle In Magic: The Gathering Equestria Daily - MLP Stuff!:

A narrow card that is hard to abuse yet incredibly powerful

Whether this is because of the format becoming more focused on low mana value cards or more answers existing to combat stolen creatures, I personally see this as a good thing

They are mainly useful for deterministic combo loops where the same prompts, priority passes, targets, mana choices, and stack-order decisions repeat several times

While this is certainly easier to do in 4 color partner builds or 5 color decks, as those mana bases usually need to lean almost exclusively on basic lands to ensure consistent access to all colors, there are more than enough nonbasic lands out there at this point that you could play this instant speed tutor in any deck containing black

I like this in decks whose win condition involves a wide board of small creatures