Sabin, Master Monk

Blitz and double strike are a matched pair here, and the pairing is the whole point. Double strike doubles whatever the body swings for, which makes the 4/3 hit like an eight-damage threat the turn it lands; blitz is the delivery mechanism that gets it into the red zone immediately, dodging the summoning-sickness tax that would otherwise let an opponent set up. The tension blitz normally carries (you rent the creature for a turn and lose it at end step) is exactly what this card wants: it is a burst of reach that trades itself for a card on the way out, then leaves you the option to do it again. The graveyard clause is the design tell. Most blitz creatures are one-and-done because the sacrifice sends them to the yard; letting Sabin recast from there using its blitz ability turns a single card into a recurring source of eight-damage strikes, each one costing a discard and refunding a draw on death. The loop is self-limiting by mana and hand size rather than by any hard cap, so the ceiling is however many times you can pay the blitz cost and keep finding a card to pitch. The friction is that discard tax paired against the mana each swing demands, not a finality counter or a once-per-game restriction, which is a quieter way to keep a repeatable haste threat honest than most red aggressors get.