Darkness Unending

Trample, protection from vehicles and dogs.
Other cat and dog creatures gain +1/+1.
{t},{p/u},{p/b}: Regenerate Darkness Unending and
grant it a +1/+1 counter.
{u/b}{u/b},{t}: Return target permanent to its owner's
hand. If that permanent has already been
returned in this way, destroy it.