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He helps thin our deck and can also become a big beater

Unranked: Honorary Bears Cards that can turn into bears are a thing, but my issue is that Id rather have a mana sink that pumps my existing bears, not one that gives me one (1) temporary bear

The more lands you play, the more powerful your forces become

The only thing missing perhaps is the ability to target planeswalkers (and battles)

Must first be Special Summoned by the effect of "The Planet Neptune", and cannot be Special Summoned by other ways

Based on this card alone, this could be a deck that focuses heavily on interaction with the graveyard to discard and recall lands, but more realistically, it is likely that the deck will be set up to pull mana from sources other than just lands to allow for the discarding of lands without it impacting the deck too negatively