Varchild, Betrayer of Kjeldor

Combat damage that hands your opponent an army, and the whole design bets that the loan comes due in your favor. Every point Varchild connects for gives the defending player that many 1/1 Survivor tokens, which looks like a gift until you read the fine print: those Survivors can't block, and they can't swing back at you or your planeswalkers. So the opponent accumulates a board that is useless against you and awkward against everyone else, while Varchild keeps feeding it. The payoff is the leaves-the-battlefield clause, which repatriates every Survivor on the table to your side the moment she dies, is bounced, or is exiled. That turns the card's central tension into a threat of self-destruction: kill Varchild and you concede the army you were forced to build; leave her alive and she keeps growing it. The design leans on the historical Kjeldoran conflict flavor, where prisoners of war are the resource being fought over, and it wears that flavor as mechanics rather than decoration. It rewards a controller of the tempo above all, since the ideal line is to grow the token count as large as possible and then trigger the reclamation on your own terms with a blink or sacrifice effect, converting an opponent's swarm into your closing board in a single exchange.