I count: 38 lands and Burnished Hart, Sol Ring, Wayfarer's Bauble, Arcane Signet, Fractured Powerstone, Mind Stone, Orzhov Signet, Talisman of Hierarchy, Commander's Sphere, Orzhov Locket, Hedron Archive, Coveted Jewel, Bitterthorn, Nissa's Animus, Ichor Elixir 52 mana
A Maralen deck seems like the perfect place to put all of those awesome cards
It has appreciated over 3 from its launch price of 17,000-25,000
While I did want to use a mix of fetchlands in the list above, I skipped Prismatic Vista, as it kind of lets the cat out of the bag about there being no splash
Currently, pre-release market expectations for Echoes of Eternity are tapering-off, with the price dropping from $20 to an average of $10