Lunar Insight

The variance is the whole design: this is a draw spell whose payload you control by curve construction, not by luck. Most blue card advantage keys off a fixed number (draw two, draw three) or off a board count that any deck can pad with tokens. This one counts something stranger: the number of distinct mana values sitting on your nonland permanents, which quietly punishes redundancy and rewards a spread-out curve. A board of four two-drops nets you a single card; a one, a two, a three, and a four nets you four. That inversion of the usual "wide beats tall" logic is the interesting part, because it asks a deckbuilder to think about diversity of cost rather than raw count, and it rewards permanents already on the battlefield rather than a go-wide token plan. The sorcery speed and the reliance on a developed board mark it as a midgame payoff rather than a tempo play: you want to cast it once the field is built, when the count is high enough to justify spending a turn drawing instead of developing. As a piece of card-advantage math it sits closer to something like Painful Truths or the old "draw X" effects than to a flat Divination, but the resource it taxes is your curve, not your life total or your mana.