Reverse Engineer

Improvise turns the printed five-mana cost into a fiction: in an artifact deck, this is a three-card draw that can resolve on turn three or earlier, because every artifact you control pays for a generic pip once you've tapped your lands. That is the whole bargain. A vanilla five-mana Concentrate would rarely make a Constructed cut, but stapling artifact-affinity onto card advantage rewards a board you were building anyway, and punishes a hand that isn't. The design lives entirely in the gap between its face value and its real value: the more artifacts on the table, the cheaper the refill, which means the card gets stronger exactly when an aggressive artifact deck most wants to keep gas flowing. Blue's traditional draw spells ask you to trade tempo for cards; this one asks you to have already spent your mana on artifacts, then converts that permanence into raw velocity for a fraction of the cost. It is a payoff card wearing a draw spell's clothing, and it only reads as expensive to a deck that shouldn't be playing it.