There's color asymmetry here. Vigilance is white, while first strike is both red and white.

Yeah I was aware of that but as this is a common I wanted to keep it simple. First Strike being both red and white, I used it for the red ability as it is a simple combat themed ability as is Vigilance.

Mmm. This seems somewhat worse than Nightguard Patrol. I guess it's a two-drop, and sure, I'd play it in Gatecrash draft, but only after I ran out of other two-drops.

Common can still be simple without the colors messing up. For example, I think I'd play it as 2/2 with ": First strike until EOT". Too little? Maybe ": First strike, haste and lifelink until EOT."

was going to change it to : First strike but in a r/w deck thats basically the same as anyway.