Rescuer Sphinx
The bounce clause runs the card's economics in miniature: leave it a plain 3/2 flier that traded evenly for its mana, or pay for a 4/3 body by picking up one of your own permanents on the way in. The second mode carries the strategy, because what you return does not have to be a liability. Bounce your own enters-the-battlefield creature and you re-buy the trigger; bounce a token and you lose it entirely but still bank the counter; bounce a spent Aura or an artifact you no longer need and you convert a stranded permanent into a stat bump. Every resolution poses the same question: is the extra point of power worth the tempo of replaying something, and is there anything on your side of the board that actually wants to be picked up? A flying body that self-buffs while re-triggering your own reuse loops sits at a genuine crossroads of tempo and value, the kind of small optimization puzzle that rewards a board built to be recycled rather than one you would rather leave alone.
