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They can sometimes be serviceable options in limited formats though

This helps you plan your future turns and play around their strategy and alter yours so you don't play into certain spells

Late in the game, you will often find yourself with a bunch of untapped mana, as all your spells are cheap, and Mentor lets you turn the creatures you draw into cantrips

Then you can mana sink his other abilities to draw, pump, give your team haste and trample, or gain 5 life

Like so many other dungeon delvers, I have dozens of stories of D&D campaigns sent screaming off the rails into the void with the party discovering a Deck in some dusty treasure hoard