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Her ability gives each other Creature entering the battlefield under your control gain a +1/+1 counter

It also acts as a sacrifice outlet in the command zone, which makes for some sweet infinite combos if youre looking to jump into high-power or even cEDH territory

They create a paired art-rare mini-story and make the set more visually collectible below the SAR tier

Effects that put cards from a players library into that players graveyard do not cause those cards to be discarded

Thats a lot for two mana, and the fact that Spreading Seas replaces itself by drawing you a card gives it a reasonably high floor even if it doesnt end up messing with your opponent too much