Endings used to be bosses, or get enough of something (complete four Quests, get four Rewards, get four Wanted Posters), or some roll a die outcome (Hand of Doom, Judgement Day), etc. There were a few unique ones, like Battle Royale or Lightbearers.
But since Nether Realm and Firelands they have been getting really cool. Nether Realm endings give you a new deck to toughen the Inner Region, any Region, or just you. I think Pandora's Box is just a wonderful ending; it's fun watching other players try to survive your onslaught. In Firelands, you play hot potato with a flaming crown or watch the land get ignited around you. In the Woodland, you explore all the side boards
and
you can have a Path to follow in each corner Region. It gives a new experience to each corner! Woodland also includes a boss fight, but it's a race to get there! As for the Harbinger, it has one of my favorite endings (spoilers):
All the civilized spaces are guarded by heralds of the apocalypse and you fight a final boss that ticks down Armageddon every time you lose to him! Crazy!
What do you think? Have you liked the endings more recently?