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Of course, this ties naturally with the airbending mechanic

When she attacks, you get to exile a legendary artifact or land from any graveyard, slapping a discovery counter on it while it is in exile, but only for this turn

You'll need a deck that can make use of your milled cards to get the full value out of Palantr of Orthanc (above all early on, when your opponent is unlikely to let you draw), but once the counters start piling up the Palantrs often a free card per turn

If an adventurer card ends up in exile for any other reason than by exiling itself while resolving, it won't give you permission to cast it as a permanent spell