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Legacy is not the reason, but the reason is related to why the card is good in Legacy

Its not easy to one-shot Pokemon and even Poke Abilities and Trainer cards have reduced effects

BPhillipYork: So it's solid card draw, potentially, but there are better ways to get "draw a card when a creature you control deals combat damage" so why play this over say Dhalsim, Pliable Pacifist

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Two mana to clear the board is incredible value and makes Vanquish the Horde one of the better mono-white board sweepers