Tortoise Formation

The defensive answer to the targeted answer. Where a single removal spell or combat trick threatens one creature, this protects the whole board at once: every creature you control becomes untargetable for the turn. The crucial detail is that it grants shroud rather than hexproof, and shroud cuts both ways. While the effect is live, none of your creatures can be the target of anything, friend or foe, so it does not cooperate with your own targeted plays the way hexproof would. That constraint dictates the sequencing, in one direction only. If a kill spell is on the stack and you want to pump the threatened creature first, the pump must go on the stack and resolve before this does; cast it on top and last-in-first-out resolves the shroud first, fizzling your own pump because the creature is no longer a legal target. The correct line runs the other way. You answer the targeted threat by floating shroud while the opponent's spell is still on the stack, voiding it because it has lost its target by the time it tries to resolve. That logic governs when the card earns a slot: against decks built on point removal and bounce, since shroud does nothing about a board wipe that never targets in the first place. Held at instant speed, it sits invisible until an opponent commits to singling out one creature, then blanks the entire exchange like a fog for the targeting step.