Sophia, Angel of the Skies

Flying, lifelink, vigilance
Sophia, Angel of the Skies gets +0/+1 for each other attacking Angel creature you control.
When Sophia, Angel of the Skies attacks, create a 4/4 white Angel creature token with flying and put it onto the battlefield tapped and attacking. Exile it at the beginning of the next end step.
"Safety's my specialty."