Just now on Arena I was playing against a [[Sauron, the Dark Lord]] Historic Brawl deck. I realized that I had lethal, but played the last 1-mana creature in my hand before attacking.
I then realized that I'd just played [[Delighted Halfling]].
Before beating Sauron.
Playing [[Smite the deathless]] to get rid of the opponent's [[Witch-King of Angmar]] was quitte flavorful. Especially the "loses indestructible" part that specifically gets around the witch-king's ability to become indestructible at instant speed !