Sure, it can Fog creatures every turn that are attacking you or remove potential blockers, but its just downright cruel against opponents with Hangarback Walkers
Oath of Eorl I don't love the delayed monarch trigger on Oath of Eorl, as it gives your opponents a few turns to dig for a Reclamation Sage or another answer, but I do appreciate how well it protects itself
(I'm not getting into how production makes cards, but how R&D handles the information.) Thus the first function of a card code is to let everyone know a card's rarity
Cemetery Gatekeeper has okay stats as a 2-drop, but having it deal 2 damage to opponents each time they play a land is a pain to deal with, especially for green players
So, whether you're buying cards online or from a store, always inspect them closely before you make your purchase