Activate his +1 before combat so you can discard a creature card, then swing in with your Writ of Return ciphered creature to bring it back to the battlefield makes for a nice line of play too
The moment you start adding Fabled Passages or DFC lands to your deck to enable a second colour, both the hit-rate and the Augur play patterns get muddied and weakened as a result
If Aang's Iceberg leaves the battlefield before the activated ability resolves, you will be unable to sacrifice Aang's Iceberg and will not scry, even if Aang's Iceberg was sacrificed via a different ability while its activated ability was on the stack
Still, I have mixed feelings about playing the card in its current form
(This is the booster we now call the Draft Booster.) The problem with this method is that it means that any restriction for one group becomes a restriction for everyone
Everyone will know which Praetor is going to show up before the spell resolves