More broadly, youd want to prioritize cards that make white spells cheaper like The Wind Crystal and Pearl Medallion and obviously other cards that offer mechanical interactions with legendaries like Gandalf the White and Heroes Podium
Ravensburger have confirmed one new keyword so far: Resist
Cut Your Losses The problem with Mill as a win-con is that in Commander and other multiplayer formats, graveyard abuse is rife, and you could hand your foe resources like flashback instants and sorceries or creatures that can self-recur like Reassembling Skeleton or adding more recurison options for that Living Death in their hand
Card Set(s) -ADVENTURE ON KAMI'S ISLAND- [OP15-EB04] CARD VIEW OP15-016 | UC | CHARACTER Fullbody Attribute Strike Block icon 4 Card Set(s) -ADVENTURE ON KAMI'S ISLAND- [OP15-EB04] CARD VIEW OP15-017 | C | CHARACTER Morgan Attribute Slash Block icon 4 Effect [Blocker] [Activate: Main] [Once Per Turn] You may give 1 of your opponent's rested DON
Interestingly, this card is from set 8, which is a full two sets ahead of the last released set Azurite Sea
Last, but not least, you could command the dark forces themselves with the Hosts of Mordor deck
