Dawnsteel Myr

Scarred (Whenever this creature is dealt damage, put
a +1/+1 counter on it.)
{1}{w}: Creatures you control with scarred or
a -1/-1 counter on them gain vigilance until end
of turn. (Attacking doesn't cause them to tap.)
"It's true. Ghalma has shaped a new form of metal truly resistant to the glistening oil. But the process is difficult - and dangerous."
- Kara Vrist, to Melira, Hope of All