I could keep it at 45, and either run a copy of something like Mezuki, or run 2 Co-Forbidden cards which would likely be of either Psy-Framelord Omega, Card Destruction, Dark Hole, Pot of Extravagance, or one of the Solemns
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Ledger Shredders basically got two free looting effects for you each turn, and it pumps itself up with a +1/+1 counter each time since theres no reason you shouldnt be discarding a nonland if youve looted well

With all that said, here are the most expensive cards from Duskmourn so far: #1 Abhorrent Oculus $30 #2 Valgavoth, Terror Eater $24 #3 Overlord of the Hauntwoods $24 #4 Overlord of the Balemurk $19 #5 Meathook Massacre II $11 #6 Gloomlake Verge $10 #7 Overlord of the Mistmoors $9 #8 Screaming Nemesis $9 #9 Enduring Innocence $9 #10 Dollmakers Shop // Porcelain Gallery $8 #11 Kaito, Bane of Nightmares $8 #12 Razorkin Needlehead $8 #13 Floodfarm Verge $8 #14 Walk-In Closet // Forgotten Cellar $7 #15 Blazemire Verge $6 #16 Funeral Room // Awakening Hall $6 #17 Mirror Room // Fractured Realm $6 #18 Thornspire Verge $6 #19 The Wandering Rescuer $5 #20 Fear of Missing Out $5 #21 Unstoppable Slasher $5 #22 Overlord of the Floodpits $5 #23 Ghost Vacuum $5 #24 Enduring Curiosity $4 #25 Overlord of the Boilerbilges $4 #26 Hushwood Verge $4 #27 Enduring Vitality $4 #28 Unholy Annex // Ritual Chamber $4 #29 Tyvar, the Pummeler $4 #30 Hauntwoods Shrieker $4 #31 Leyline of Resonance $3 #32 Demonic Counsel $3 Thats it

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How the Deck Works Vaporeon is a key support Pokmonuse it early to ensure Palkia EX and Articuno EX receive Energy quickly