White Sun's Zenith

The instant-speed X spell that refuses to be a one-shot. Token-makers scaled by X are common enough, but most of them spend themselves: cast, resolve, gone. The shuffle clause is what lets this one persist. By returning to the library instead of the graveyard, it survives every graveyard-hate effect and, more importantly, becomes a recurring mana sink. Pour ten mana into it now, draw it again in twenty cards, pour fifteen mana into it then. The triple-white cost is the price of that loop: it locks the card to a white-heavy build and keeps the early-game floor honest, since the X tokens are unhasted 2/2 Cats that ask you to either protect them a turn or hold the spell as an instant. That timing is the underrated part. Holding it up means representing an interaction (a counterspell, a removal spell, a combat shift) and then dumping a board on the opponent's end step if nothing materializes, arriving with summoning sickness already worn off by your next untap. The design tension it resolves is the classic one for big-mana white: a payoff that wants to be drawn repeatedly without becoming a draw-step crutch. The shuffle answers it cleanly, trading the certainty of a card in hand for the inevitability of seeing it again.