Aaronson's owl

Flying, vigilance, first strike
When Aaronson's owl deals damage to a player Aaronson, brewer of the arts gains loyalty counters equil to the damage dealt.
When ever legend rule activates pit a +1/+1 counter on Aaronson's owl and Aaronson, forbidden witch.
{x}{b}: all birds you control get +X/+X until end of turn.