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With cards like Substitoad completely unlimited, Frogs were great for spamming the field, be it for tribute summons, synchro summons, or whatever shenanigans required a field of 5 monsters

Increase serves one purpose

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Not only that, but Valkyrion has a specific summoning condition: the player has to tribute the Magnet Warriors trio (Alpha, Beta, Gamma)

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Snow only has a Book of Moon effect, but it essentially lets you interact with the opponent in multiple ways at once because you can keep it in your graveyard and keep playing your board on the table