Unexpectedly Absent

The X is a depth dial, and it changes what kind of answer you are buying. Crank it high and the spell becomes near-permanent removal: a setback that buries a threat beneath enough cards that its owner may never see it again, all while sidestepping indestructibility, regeneration, and graveyard recursion in a single motion, since a permanent relocated to the library was never destroyed and never died. Set X to zero and you get the honest opposite: the permanent goes on top of the library, a one-turn delay that hands the threat back as their next draw. That spread, from a buried problem to a polite redraw, is what keeps this from being a flat upgrade on white's destruction spells; you are always paying for how deep, never for finality. Tuck removal trades permanence for reach, and the instant-speed casting widens that reach further: the window to blank an attacker before damage, deny a creature its end-of-turn trigger, or answer a freshly resolved threat on the opponent's turn stays open. The cost is that the same threat can be a six-card problem or a one-card inconvenience depending on what mana you can spare. It belongs to the small family of white catch-all answers that solve the "destroy is not enough" problem by relocating threats rather than killing them, distinguished from flat tuck-to-top or tuck-to-bottom designs by exactly that variable depth.