Owlin Spiralmancer

X spells have always been awkward territory for copy effects: they scale beautifully, but a Fork or Reverberate spends a whole card and a whole turn to double one thing. Here the trigger comes stapled to a 3/4 flier whose vigilance lets it press an attack and still hold back a blocker, and it fires on the first spell with in its cost you cast each turn without asking for extra mana or a second card. That timing clause is the balancing lever. Once-per-turn keeps a burst of ritual mana from spiraling into a runaway engine, and "first" specifically rewards front-loading the big one rather than chaining a handful of small ones. The copy inherits whatever value X was set to on cast, so a Fireball resolved at eight copies at eight, a Torment of Hailfire doubles its full count, a Comet Storm redoubles its scaled reach. Permission to choose new targets is what converts a single drain or burn spell into a two-headed strike that can split across the board. Because only one X spell benefits per turn, the payoff structure it wants is a few large finishers rather than a pile of cheap ones: it rewards going tall on a single spell, not wide across many. As a four-mana enabler rather than a legend, it is the copy-the-Fireball trigger those shells have always wanted, offered without spending its own card to get it.