I prefer these to Flayer, Herald of Secret Streams, etc since they help you come from behind when Marchesa isn't out, and having "finishers" that rely on your engine being all in place isn't all that effectively different from just running some combo (Metallic Mimic / Murderous Redcap is the most efficient one for Marchesa imo if you wanted to go the route)
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This includes face-down monsters, Traps, and Spells
7 Nashi, Moon Sage's Scion Trade Life For Spells Nashi is both a great Rat and commander, letting you cast the top card of someone's library whenever it deals combat damage
[F][C][C] Bind Down: 80 damage
Viscera Seer specifications: Pros A super speedy Sacrifice outlet No extra cost to Sacrifice creatures Cons Easy for opponents to remove If you want to start Sacrificing early, Viscera Seer is one of your best options