Skullwinder

The recursion that admits the trade. Eternal Witness returns a card from your graveyard with no string attached; this Snake reprints that template at the same mana rate, then hands an opponent a card back from their own yard in exchange. That symmetry is the whole bargain. Multiplayer green has always had access to clean regrowth-on-a-stick, so the design question is what you pay to keep it cheap, and here the cost is goodwill: you advance one opponent while you advance yourself. The political math rarely favors the table evenly, because you choose which opponent gets the gift, turning a downside into a lever. Hand it to the player least able to capitalize, or to the one whose graveyard holds nothing worth retrieving, and the drawback thins to almost nothing. The body matters too: where Eternal Witness offers a fragile 2/1, this is a 1/3 with deathtouch, a defensive frame that trades up in combat and gives the Snake a job after its enter-the-battlefield trigger has resolved. What makes the card durable is that the return targets any card, not just a creature or an instant, so it threads land recursion, bomb retrieval, and combo-piece rebuy through a single trigger. The opponent's free card back is the friction, but note it lands in their hand, not on the battlefield: a known quantity, telegraphed, and friction you get to aim.