If youre trying to build a huge Army, youre going to be a little less interested in repeatable effects that let you amass, and more interested in cards that can give you an incredibly high Amass value
Nissa and Chandra discover that the plane has been altered by Bolas, who has gone so far as to somehow remove three entire gods from the plane
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And considering that Palkia ex is also durable and can immediately come out swinging with a 1-energy attack yeah, it's clearly going to be a strong contender, even if it doesn't emerge as the best card
The Mana Base The deck contains a lot of mana rocks
It's a win condition that converts all those cheap spells into an onboard advantage, and Murktide only gets bigger as the game continues