My most commonly tutored for card
these are referred to as crimps. Crimps vary in all shapes and sizes, and the more crimped the card, the more its worth
Facilier Charlatan Dragon Fire Duke of Weselton Opportunistic Official Elsa Snow Queen Elsa Ice Surfer Elsa Spirit of Winter Elsa Queen Regent Else Spirit of Winter (Secret Rare) Eye of the Fates Fan The Flames Fire The Cannons
Jukai Naturalist makes enchantments cheaper, and Generous Visitor gives a +1/+1 counter every time you play an enchantment
You do need to build around this in order for it to be worthwhile, however, which certainly limits its usage
There is of course room for disagreement here and your lines might be different from mine, but specific cards that I believe work well, as well as cards that I dislike, are important for the purpose of this discussion