Mana This section is full of mana rocks and cost reducers, like Sol Ring, Arcane Signet, and Ruby Medallion
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Just sacrifice a trivial merfolk token after each swing and you can easily complete a victory lap of the table (or set up a different win con) over several consecutive turns
As it stands, the prices are as follows: Secret Lair x Monster Hunter: The Hunt Blind Obedience - around $3 Snap - around $2.50 Village Rites - around $0.25 Mizzium Mortars - around $0.45 Tooth and Nail - around $2 Total value: $8.20 Secret Lair x Monster Hunter: The Hunters Grand Abolisher - around $10 Archaeomancer - around $0.20 Grim Haruspex - around $1.30 Imperial Recruiter - around $12 Champion of Lambholt - around $2 Total value: $25.50 Secret Lair x Monster Hunter: The Monsters Nezahal, Primal Tide - around $8 Sarulf, Realm Eater - around $0.35 Vaevictis Asmadi, the Dire - around $1 Ziatora, the Incinerator - around $0.30 Drakuseth, Maw of Flames - around $0.50 Total value: $10.15 Secret Lair x Monster Hunter: The Monsters 2 Wasitora, Nekorus Queen - around $0.50 Kalamax, the Stormsire - around $0.40 Amareth, the Lustrous - around $0.25 Razaketh, the Foulblooded - around $8 Total value: $9.15 Sol Ring is generally inexpensive on its own (at about $1.20), and while it's a collector's item when it comes out in different, special versions, this doesn't really increase the value of the superdrops
The fact that Unsettled Mariner also counters abilities and not just spells can put a hamper on any sort of enter-the-battlefield effects your opponents might be playing
