Specifically, there are lots of cards that check if you have five or more different mana values in your graveyard, like Sanguine Spy , Sewer Crocodile , Aven Heartstabber , All-Seeing Arbiter , and Snooping Newsie
For example, Cayth makes a Servo by herself, so every two mana lets us populate the Servo, untapping all creatures and letting us do it again
She combines aggression, card filtering, and late-game token production, giving players multiple paths to victory
However, if even a single card falls off your head, you have to exile all of the cards and sacrifice this enchantment
Aura and Enchantment focussed decks are naturally the perfect home for it, alongside God tribal decks built around effects like The World Tree
Play tutorial games with Cats and Vampires decks and explore more mechanics with themed Jumpstart packets