Perrin Aybara

When Perrin Aybara enters the battlefield,
search your library for an artifact card and
put it in your hand.
{2}: Put a Wolf counter on Perrin Aybara
Do this only once per turn as a sorcery.
When Perrin Aybara gets five or more Wolf
counters, remove all Wolf Counters and
transform Perrin Aybara.