Goblin Picker

The tap-and-discard loop here is the oldest trick in red's book: pay a mana, turn a dead card into a live one, and do it on a body rather than a spell so it sticks around turn after turn. Because the ability lives on a creature that has to tap, the rummaging is repeatable in a way one-shot filtering never is, and that repetition is the whole point. It fuels every strategy that wants specific cards in the graveyard rather than the library: discard a fatty to reanimate, pitch a flashback or unearth spell to buy it back, dump a card that hits its stride from the yard. The catch is that this is card filtering, not card advantage: each activation is a strict one-for-one that costs mana and the whole combat step (the goblin taps to do it), so the body sits home rather than pressuring the board. That tension is the design's honesty. A 2/2 that both attacked and refilled your hand every turn would be a staple; here you choose between beating down and digging, one activation at a time, with the mana cost keeping you from doing it for free. It is a graveyard-matters enabler stapled to a modest attacker, built for decks that would rather choose their cards than draw them at random.