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While it's still fresh in the US market, we can make educated guesses about card values based on trends from the Japanese release and anticipated pricing on TCGPlayer

Both also below

White's been doing much better across all formats as of late

Modern Braingeysers aren't targetable, but will often add something else to the conversation

In summary: Whatever the source (rule or explicit), Breeding Pool needs 2 mana abilities because other cards can take away one basic land type (and thus mana ability) while leaving the other intact - 305.6 simplifies the templating necessary to add and especially take away mana abilities based on the basic land types a land gains or loses

Well, the artwork shows why -- it's removing its own giant clockwork from its back