Theres no doubt Pokmon Co
Or just a large creature that provides a mass-sacrifice trigger so your Blood Artists and whatnot blitz the table
Even with just a single Drowned Secrets on the battlefield, something like Merfolk Secretkeeper (both the adventure and creature modes) into Callous Dismissal on Merfolk Secretkeeper into Merfolk Secretkeeper again ends up milling 18 cards for a total of six mana, making it a great way to close out the game once our opponent's library starts to dwindle
Typical production is two business days
Like with switching methods, it's generally a good idea to run three or four Energy recovery cards whenever possible, but I would prioritize this category over switching methods (so for example, if you have seven slots for the two categories, I would use four Energy recovery cards and three switching cards instead of the other way around)
Until then, Ill see you in the next one