they're fine on card draw, but Bears
Gauntlet is also just a generically good combat enabler, but decks like Hylda of the Icy Crown are going to absolutely consider this include
Not only does this tie up their mana each turn, but when they can't pay it anymore, they lose 20 life
ILLUSTRATOR Inuchiyo Meimaru LEGALITIES Standard Future Historic Timeless Gladiator Pioneer Modern Legacy Pauper Vintage Penny Commander Oathbreaker Standardbrawl Brawl Competitivebrawl Alchemy Paupercommander Duel Oldschool Premodern Predh Tlr LANGUAGES DE EN ES FR IT JP PT ZH-CN RULINGS 2019-01-25 A face-down creature has no name, so it can't share a name with anything
All that mana does no good if your well-known threat of a commander gets countered, so a Cavern of Souls is excellent protection
It was the echo experiment that got them to the idea that you could steal a creature of any mana value but only got to keep it if you were able to pay the energy cost