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You may choose not to untap Frightshroud Courier during your untap step.
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: Target Zombie creature gets +2/+2 and has fear for as long as Frightshroud Courier remains tapped. (It can't be blocked except by artifact creatures and/or black creatures.)
It checks the creature type when the ability is announced and resolved, but once the effect is placed on the creature, if its creature type changes the effect still continues.