Demon's Disciple

Symmetry is the design trick here, and it is doing more work than it looks. A one-sided edict would price this body at a premium; making both players sacrifice something instead lets the card come stapled to a 3/1 for a fair rate. The catch is that symmetry only serves you when the accounting is lopsided in your favor, which is exactly how this kind of effect earns its keep: you cash in a token, a spent creature, or a card you were happy to lose, while your opponent gives up something real. The "of their choice" clause is the balancing hinge, because it hands each player the discretion to protect their best permanent, so this is not a targeted removal spell dressed up as a creature. It is an edict, in the older sense of the word, closer to Chainer's Edict or Diabolic Edict than to spot removal, and edicts are answers to hexproof, to the single fat threat, to the board an opponent has committed everything to. Bundling that onto a creature that dies to almost anything is the trade: the effect wants to fire when the sacrifice math is asymmetric and your fragile Cleric is expendable anyway. It is the kind of black card that rewards a sacrifice-fueled shell where feeding the edict is a feature rather than a cost.