If not, it phases in unattached
The most important aspect is to ensure your win condition needs cards in the graveyard
I'm swapping out Pantlaza, Sun-Favored for Wayta, Trainer Prodigy in the command zone, keeping Dinosaurs as our main theme but increasing our focus on the Enrage subtheme
In Shimmering Skies we got many useful new cards that saw the meta broadening a bit, as well as a host of gorgeous enchanted cards that fit the party theming perfectly
Some of my favorite decks have been different flavors of WU control, so exploring the ins and outs of the color pair has been a lot of fun
Marneus seems to be doing the right combination of things to be a great tokens commander for you to build around, and the perfect card to headline the Imperium deck