It’s an uncommon. This is great for budget players.
This is not a format for budget players, especially ones who cannot afford Grafdiggers cage.
I actually think the benefit here could make this viable as a sideboard card.
- Diversity - Cannot be extirpated if they get your cages, cannot be named by meddling mage, Dodges MM but does get hit by spell snare (which sees no play), can dodge a CotV set to 1
- Coverage - Does in fact cover more cards than cage as the OP pointed out. If Lurris was not banned, which at this point is something that could happen, this would stop him.