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You can activate Arcum for Sewer Cam, untap him, Arcum for Repurposing Bay, sac the Cam to get Corridor Monitor, untap Arcum and hold priority to sac the Monitor for Encroaching Mycosynth, and now you can even sac Arcum to himself to get Mind Over Matter, and use Repurposing Bay to get The One Ring, and now you can fire off the MoM + TOR combo you mention

A second set is already planned for this November, with no details on what it will introduce to the game - beyond more cards

If it was an instant then I would be all over it

Captain Lannery Storm's last ability triggers whenever you sacrifice a Treasure for any reason, not just to activate a Treasure's mana ability