One convenient piece of math that pops to mind is Modern Ad Nauseam
Devotion decks are notorious for generating a frankly ridiculous amount of mana, so anything you can sink your mana into is an extremely attractive inclusion
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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I would have him about 4th on the list
The Fertile Lands of Saulvinia, Antausia Antausia is a plane that went unrecorded up until early 2019
