Aerie Scavenger

Flying
When Aerie Scavenger enters the battlefield,
put a +1/+1 counter on each other creature you control with flying.
"At first I wasn't sure why the stablehands tolerated
the vultures, but later I learned that they eat the
scraps of meat the wyverns leave behind, saving the
stablehands a lot of work."
- notes from Ruszara's flight journal