Souls Bonded as One

If an Abyss Watcher you control dies and if you control no other creature called Abyss Watcher, exile all Abyss Watcher creatures in your graveyard. Than choose one nontoken Abyss Watcher in exile and place it on the battlefield with a +X/+X counter and
Trample on it, where X is the number of creatures called Abyss Watcher exiled by this instant.