Aang's Iceberg

If a token is exiled this way, it will cease to exist and won't return to the battlefield.

If Aang's Iceberg leaves the battlefield before its triggered ability resolves, including if it is sacrificed by its activated ability, the target permanent won't be exiled.

If an artifact or creature you control has a mana ability with tap in the cost, activating that ability while casting a spell or activating an ability with waterbend will result in the artifact or creature being tapped before you pay the spell's costs. You won't be able to tap it again for waterbend. Similarly, if you sacrifice an artifact or creature to activate a mana ability to pay a cost with waterbend, that artifact or creature won't be on the battlefield when you pay the spell's costs, so you won't be able to tap it for waterbend.