While other cards over the years have featured effects similar to this (mythic rare Zur, Eternal Schemer from Dominaria United comes to mind), Opalescence was the first to do it en masse for enchantments, and, due to its novelty and being first on the scene, it clocks in with a price point approaching $30
and Samwise the Stouthearted are legendary creatures, so you can have them in your command zone to always have access to the Ring tempts you simply by having them enter the battlefield
Three-color bases are tough, but by now, Wizards has the ideas and resources to make them good
Almost every Pokmon has several types of attacks that need from 1 to 4 Energy cards
Just getting the Morbid trigger once is enough to feel good about things, and that's good -- but don't expect to make this go off one very turn
Features full-art Pokemon with unique backgrounds