Howler of the Lost Pack

Howler of the Lost Pack has Spiritform.
{4}{g}{g}: Put two +1/+1 counters on each creature
you control.
"My connection to wolves goes beyond the living ones.
If I listen carefully, I hear the howls of wolves that
used to be. They still prowl in the wilds, and still
run with long vanished packs."
—Arlinn Kord