mtg forgotten realms commander deck lists Tiamat [Dungeons & Dragons: Adventures in the Realms] Adventures in the Forgotten Realms

Zoraline and Three Steps Ahead are key new cards worth considering, offering unique abilities for different deck archetypes

Palace Jailer has a particularly powerful instance of this as it comes with an exile ability

*Updated December 5, 2023 to new cards and strategies revealed in Rise of the Floodborn

Ponder in Magic 2012 comes to mind

Riverchurn Monument (one of Aetherdrift's better offerings) is a good alternative to a "mill half your library effect" and can easily pull wins out of games that seem hopeless

Wherever the remaining copies are hiding, they're likely worth even more money if they're in a more pristine condition