Primordial Gnawer

A 5/2 lives to die well: it trades poorly on defense, folds to any burn spell, and wants to run into a bigger blocker, yet every one of those disappointing exchanges cashes out into a free spell. Discover 3 is what converts the fragility into a resource, exiling down until it hits a nonland of mana value three or less and casting it for nothing. That inverts how you read a body that trades down; the creature is a delivery mechanism, and the second card is the actual payment. It sits in the long line of black creatures built to be spent rather than protected, where death is the trigger and value is the reward. What distinguishes discover from a straight draw is the free cast paired with the mana-value ceiling: you are not promised your best card, only a cheap one, cast on the spot or held. That reward structure asks for a curve stacked with two- and three-drops worth flipping into, since anything above the cap gets shuffled past. The trigger fires unconditionally on death, but the ceiling caps what it can find, so the deck around it decides the payout: a shell dense with castable small stuff pays this out far better than one topheavy with bombs it can never reach. It is a creature that returns the most when it is gone, and it makes no secret of that.