Onslaught

Frightshroud Courier

You may choose not to untap Frightshroud Courier during your untap step.
o2o
B, oc
T: As long as Frightshroud Courier remains tapped, target Zombie gets +2/+2 and has fear. (It can't be blocked except by artifact creatures and/or black creatures.)

You may choose not to untap Frightshroud Courier during your untap step.
{2}{B}, {T}: 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.)