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You may choose not to untap Ghosthelm Courier during your untap step.
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: Target Wizard creature gets +2/+2 and has shroud for as long as Ghosthelm Courier remains tapped. (It can't be the target of spells or abilities.)
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.