Worg Rider

Worg Rider has haste as long as it doesn't have a -1/-1 counter on it.
When Worg Rider dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.
Fearsome enemies that fight from the back of their battle-ready mounts. They dismount only when their Worg dies.