Firestorm Phoenix

The death-replacement clause is where the whole design lives, because the body itself (a 3/2 flier at this cost) is a rate the card never tries to defend. Instead of dying, the phoenix bounces to hand, and the printed memory restriction is what keeps that loop from being free: it sits revealed in your hand, uncastable until your next turn, paying a public-information tax for the privilege of coming back. That tax is the interesting work. The recursion is real, but it is gated by a window the opponent can plan around: they see the phoenix waiting, they know exactly which turn it returns, and they get until that turn to set up an answer that sticks. Modern templating would almost certainly solve the same death problem with exile-based recursion (the path later phoenix designs took) or with a counter that caps how many times the trick fires. Early design did not have those tools yet, so it reached for the closest available substitute: a hidden-zone restriction dragged into the open and spelled out longhand. The result is a recursive threat that answers its own death the way the era answered most novel problems, by writing the exception onto the card itself and trusting the players to track it.