Mana Crypt Ditto everything about Sol Ring, but dial it up to 11
The only problem with Mount Doom is it costs life to make mana, so you don't really want to draw it early
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Proliferating it will also let you use it as protection for something like Atraxa, Praetors Voice Preston, the Vanisher FromTheShire: Let the Felidar Guardian shenanigans commence
This deck is pretty much pre-built, with room for small tweaks with cards like Charlotte Pudding