Compulsive Research

The discard clause is the whole design conversation here, not the draw. Three cards for three mana is a rate older designs reserved for the steepest costs (Concentrate's full payment, Tidings paying an extra mana), but this version sells the third card for a much softer price: pitch a land you no longer need, or pitch two cards if you can't. That conditional turns a flat card-advantage spell into a smoothing tool that punishes you least when you're flooding, which is exactly when a draw-three is most welcome. The interaction with graveyard payoffs is what kept it relevant across eras: it doesn't ask whether you want cards in the bin, it forces two there unless you have a land to spare, making it a natural enabler for delve, flashback, and reanimation shells that would happily fill their own graveyards anyway. The structural cleverness is that the "drawback" and the "payoff" point in opposite directions depending on the deck, so the same line of text reads as a tax to one player and a bonus to another. The restriction does real balancing work without ever feeling punitive, because the cost is paid in resources you've usually already decided you can lose.