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The easiest method is to paste your list (one card per line) or upload/export from a deckbuilder

Castle Vantress has quite a steep cost but I still expect to run it in a bunch of decks, either as topdeck manipulation for decks like Melek, Izzet Paragon or as a mana sink fo Draw-Go decks like Talrand, Sky Summoner

Servant of the Conduit: [Category 2] ETB yield is 2 Energy for 2 mana, then you can spend 1 Energy to get one mana of any color

Zen Takahashi If you have gotten this far, you would have guessed by now what came in first place

Eidolon of Countless Battles Its apparent from Sams article that they are pushing Eidolon a bit more than Keldon Warlord

Rampant Growth 50 Cards Would mana ramp be called ramp without Rampant Growth