This is a brand new format, that has the top layer, the sticker, having a tiny Ditto icon where you would usually find the Set Symbol (otherwise known as the Tournament Regulation Mark)
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Its full of ample value if you do and recurring a [casthaven]Sundering Growth[/casthaven], [casthaven]Wayward Temple[/casthaven] and a fetchland feels pretty good
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Tale of Momo's first ability)
I dont know of another deck that people are supposed to be more afraid of, but I expect a diverse metagame where this is a player, and Id be surprised if Mono-Green Devotion is the most-played deck