Goldnight Castigator

A 4/9 flier with haste for four mana reads like an undercosted wall until you notice which direction the doubling points: it applies only to you and to the Angel itself, never to your opponents. That asymmetry rewrites the whole equation. The nine toughness is not the fortress it looks like, because anything aimed at the Angel hits twice; a five-damage spell buries it, and most of red's own removal clears it without trouble. The more dangerous clause is the one on your own life total, which quietly turns every burn spell and every attack that connects with you into a doubled cost. You are not punishing the table; you are agreeing to absorb twice the punishment yourself in exchange for a hasty four-power evasive body. That tension points the card in exactly one direction: this is a race card wearing defensive stats. The flying and haste want you attacking immediately, the 4/9 frame tempts you to sit back, and the doubling makes sitting back lethal, since every turn the game runs long your halved effective life total works against you. The levers that make the drawback survivable are the ones that manage incoming damage itself: lifegain to outpace the math, redirection to change who absorbs the hit, prevention to neutralize it outright. Note the clause only touches damage, so payments like fetch lands or Phyrexian mana cost their normal life. Left alone, it is a fragile haymaker that asks you to close the game before the contract you signed comes due.