Aang's Iceberg

Temporary exile is an old white idea, but this one hands the eviction notice to you instead of the opponent. The enchantment banishes a nonland permanent only for as long as it survives, which is the usual rented-answer arrangement: kill the enchantment, get your threat back on the battlefield. What changes the calculus is the waterbend line, an escape hatch the controller can pull on their own terms. Sacrifice the enchantment yourself and you dissolve the exile deliberately, refunding two scry looks in the process, so once the tempo window has done its work you convert a fading answer into card selection rather than waiting for the opponent to break the loan. The alternative cost is the wrinkle that makes this cheap: tapping your artifacts and creatures to each cover a generic mana means an established board can pay the sacrifice cost for almost nothing, which reframes the whole card. It is not a static removal enchantment sitting on the table daring you to destroy it; it is a piece you can retract before it becomes a liability, pre-empting the opponent's plan to shatter it and reclaim their permanent for free. Flash is what makes the timing yours: hold up mana on an empty board, answer the first threat to resolve, or ambush a freshly cast permanent before it takes a turn. The exile window opens and closes on your schedule, not theirs.