Blight Mamba
Green already has a lot of creatures that produce mana (Innistrad Remastered's Somberwald Sage is one that just didn't quite make the cut for this list), but what if all your creatures could produce mana

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Players would eventually discover that Emrakul was a harbarger of things to come, as additional bans loomed on the horizon
Or, for more digital trading card game goodies, here's the latest on MTG Arena decks and MTG Arena codes.
Ancient Cornucopia One of my favorite cards to run in multicolor decks due to its ability to stabilize, Ancient Cornucopia gives you steady lifegain whenever you cast a multi-color spell while also fixing your mana