Yarrow Ranger

Mountainwalk, vigilance
Whenever Yarrow Ranger enters the battlefield
or attacks, you may search your library for a
creature card with power 2 or less, reveal it, and
put it into your hand. If you do, shuffle.
Whenever a creature with power 2 or less enters
the battlefield under your control, put a +1/+1 counter on Yarrow Ranger.