Tattered Watcher

Flying, vigilance
Whenever Tattered Watcher blocks a creature, create a 1/1 white Spirit creature
token with flying.
Stalk {w}{w}{w} (At the end of each block
step, if there is an unblocked creature attacking
you, you may cast this card for its stalk cost. If
you do, choose an unblocked creature attacking
you. This creature blocks that creature.)