text: Aegis of the Legion's last ability triggers when a mentor ability of the equipped creature resolves. If it became unattached from a creature before a mentor ability of that creature resolves, Aegis of the Legion's last ability won't trigger when that ability resolves. Similarly, if Aegis of the Legion becomes attached to a creature that is the source of a mentor ability on the stack, Aegis of the Legion's last ability will trigger when that mentor ability resolves.