The dark aura of Umbreon, combined with its Terastal crystal effect is one of the reasons this card skyrocketed in value shortly after release
Bond lands are popular choices for Commander land bases, and as long as the format stays popular these lands should be too
The ability to win a game with a card that should just be an insurance policy is a big part of this being a 10 on this scale too
This loop does put the creature card into the graveyard so you'll be able to make an arbitrarily large Fungus army
Cheap spells, rituals, and draw effects suddenly become repeatable resources
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
