Land may be chosen, but it's not a good idea
One of the most pushed green planeswalkers, Nissa can make potentially huge tokens, remove artifacts and enchantments, and for the finale, you can massively pump your creatures and give them trample
This is a four-mana White Enchantment with landfall, which means something happens when you a Land enters the battlefield under your control
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She traveled across the length of the plane, uncovering other archives that had been spared from the dragonlords' purge, speaking with whisperers and ancestral callers in hiding and building a picture of the true history Ojutai had kept from her
This mechanic obviously pairs nicely with Proliferate, but is also just an intriguing bit of design to represent the idea of radiation in general