Gold Warden

First Strike when blocking, Vigilance
If none of your opponents controls any creature, Gold Warden gains Defender.
Restoration 3 (If this creature is sent to the Graveyard, it stays on the battlefield and is tapped instead. Then put 3 sleep counters on this creature. During your untap phase, if this creature has Sleep counters on it, remove one of them and do not untap this creature)