Sorry, I guess I wasn't clear. I like the 2 mana for the +1/+4 and first strike, what I was against was using a counter for +0/+1.
I don't know how much better this looks but what about:

{W}
Instant
Put a +1/+1 counter on target creature. That creature gets +0/+2 and first strike until end of turn.
Sort of like Battlegrowth, but better because of the double color in the casting cost, and the fact that battlegrowth wasn't even all
that good in limited.