Thorla, Bladeweaver Escort

Whenever Thorla, Bladeweaver Escort attacks, put a +1/+1 counter on each other attacking creature. Then if you control an attacking creature with power 6 or greater, Thorla gains doublestrike until end of turn.
"Sheathe your weapons or its going to get bloody.
I will not be aggressed and I will not be the
victim."