They are cautious with their body language and facial expressions. Any stray movement could betray the positions of the troops they protect and cost many lives.

Commander Anthology

Aerie Mystics

Flying
{1}{G}{U}: Creatures you control gain shroud until end of turn. (They can't be the targets of spells or abilities.)

Commander 2013

Flying{1}{G}{U}: Creatures you control gain shroud until end of turn. (They can't be the targets of spells or abilities.)

Conflux

Flying
{1}{G}{U}: Creatures you control gain shroud until end of turn.