Visionmist Wanderer

You may cast Visionmist Wanderer from exile. If you do, return a card exiled by Visionmist Wanderer to the battlefield tapped under its owner's control.
Whenever Visionmist Wanderer blocks or is blocked by one or more creatures, you may exile one of them and Visionmist Wanderer.
Creatures your opponents control entering the battlefield don't cause abilities to trigger.