Errant of Amestrus

Herald (Creature spells you cast that share a subtype with this card enter the battlefield with
a +1/+1 counter on them.)
Errant of Amestrus can't block white creatures.
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Whether by choice or by duty, Amestrian Errants are given the sole task of venturing beyond empire borders for any land untouched by the Cannibrae sickness. Very few return as pure as they left.