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Altar of the Brood Mill per Card: 4ish Mill per Mana: 4ish This probably works out about as good as Codex Shredder and the Bell

But back to the downside

Vraska, Betrayal's Sting Vraska, Betrayal's Sting takes advantage of the truly horrible combo that is poison and proliferate

The discard option works particularly well in Reanimator, Madness, and other graveyard-focused strategies, but the Artifact option is what gives Demand Answers its real flexibility

While you have to put two cards back on top of your library, this isn't as much of a downside as you might think

Stridehangar Automaton $13.92 Creating a 2/2 flier whenever you create an artifact token is pretty solid, and Stridehangar Automaton isnt restricted to once per turn, either