one piece card game royal blood op 10 Booster Box It also features many cards that strengthen Land of Wano and ODYSSEY type cards One Piece OP10 Royal Blood

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

In fact, I would say that there are some situations where you should be playing these cards

Two land drops (or one Fabled Passage) and this is already above rate as a 2/3 for one mana

Cavern of Souls If Aether Vial is the heart of creature decks, that makes Cavern of Soulswell, the soul

To close things out, lets take a look at Ruthless Technomancer