Considering how few chase cards it boasts across the TCG, this Clefable card is likely to remain among the most valuable on its roster for the foreseeable future
For entrenched Magic players, though, there are also new cards to brew with
In a world with cards like Stormbreath Dragon and Polukranos, World Eater running around, six mana needs to buy you something pretty saucy to want to go that high
The modes are quite different from each other, too, but giving your whole team hexproof, while maybe slightly over the top as most spells only target a single creature, is a good bit better than just giving hexproof to one of them
Last but not least, the design of a card can also influence its popularity