Caravan Thrinax

Exorcism — As long as there are no cards in
your graveyard and you control no black permanents, humans you control have protection from black.
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"You out'a yer mind, lad? This ain't no safe
place. Stay with the caravan, an' keep yer eyes
peeled for prowlers, and maybe you'll get lucky."
-Gaverus, Terra-Kledd Trader