In "Return of the Weatherlight", Urza's Blueprints have been discovered, and someone has decided to recreate and modify on the original Weatherlight. Each person on the team has been tasked with creating an evocative Legend to add to the crew of the the new Weatherlight, and a Legendary Artifact that will be a part of the Legacy Engine that fuels the Weatherlight. (For those who don't know... parts of the Legacy Engine don't need to look like engine parts. The engine consisted of roughly random artifacts, though, each one was unique).

The events of Return of the Weatherlight take place after Timespiral, with a Dominaria returning to normal. Characters and artifacts can come from planes other than Dominaria, but would need a back story as to why they are now on Dominaria.

For more information on the Skyship Weatherlight, you could always start with MTGSalvation's Wiki Entry

­Pau, Skyhound and Moonstone Cannon, not really addressing the challenge, and not really any damn good either. Though I do think the ability on Pau should exist somewhere.

Tricky. Not many characters from Dominaria are still alive post-Time-Spiral, and those who are were still busy leading their factions last we heard (Commander Eesha, Llawan, Cephalid Empress, etc). Braids is a possibility, but I went for Arcanis the Omnipotent and created Arcanis, Vagrant Archmage.

As for an artifact... given how random the original Legacy was, basically any artifact could do here, couldn't it? I mean, the original Legacy included the Null Rod, the Touchstone, the Skyshaper, even Squee's Toy, not to mention Karn, Silver Golem himself. Bit hard to narrow anything down based on that.

Aw, man. I know absolutely nothing about this part of the story.

@Alex: I figured adding a piece to the Legacy was a natural extention of the challenge. The pieces of the Legacy were rather random... I think Wizards just slapped 'Legendary' on artifacts they already had planned and called it a day. Still, it's an interesting challenge to try to intentionally create a seemingly random Legendary artifact that feels like a part of the new Legacy. Bit of a mind stretch.

@Link: You really don't need to know a damn thing about the Weatherlight story. The ship went kablooie, and everyone, except Karn, died (though, I never read Apocalypse. I suppose some of them may have survived).

If you're having a hard time wrapping your head around The Weatherlight, just imagine the same plot with a different crew. A new Firefly crew, or a new Star Trek crew should jump a few ideas in your head.

I created Red Shirt of Sacrifice and Loredata, Duranium Golem.

Added The Dread Helmsman, Maroney. I'll come back to add a piece of The Legacy later.

Added Legacy Storage Matrix, then realized I had designed a broken card.

Oh, hey. I made Sora, Navigator Extraordinaire and Pathfinder's Legacy, but I never put them here. Go figure.