Sawtooth Loon

Return a white or blue creature you control to hand and the obvious target is the Bird itself, which turns a one-shot dig into a recurring filter: replay the Loon next turn and you draw two and bottom two again, every cycle, behind evasion. That self-bounce is the throttle on what would otherwise be a dangerous engine. The draw two is matched by the put-two-on-the-bottom clause, so each loop sculpts your hand rather than expanding it; you sift toward your good cards without ever gaining raw advantage. And the mandatory return means each refire costs a full tempo beat and four mana to set up again. That symmetry is the whole reason the card is a value piece instead of a broken one. It belongs to a small family of self-bouncing enters-the-battlefield creatures, the ones that pick themselves up to replay their own trigger, a recurring motif of its block. The flying and the Bird type are almost incidental to what the engine does; the card's weight comes from being one of the cleaner early expressions of dig-without-net-advantage, a structural idea later filtering creatures returned to repeatedly. The loop is slow, it never expands the hand, and it never runs out either: patient blue-white shells that can spare the tempo get a grind machine that, behind a flier, tends to win the long game on selection alone.