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While this does suggest that green is relatively weak overall, theres more going on than that

It could be a spell or ability that tells you to put a land card onto the battlefield

This card has only seen one printing from an official set in Magic history, and thats this Urzas Saga version

add 1 WATER monster from your Deck to your hand with the same Type but 1 Level lower than the revealed monster, then you can change this card to face-down Defense Position, also you cannot Special Summon from the Extra Deck for the rest of this turn, except WATER monsters

And what's even better is, this was one of three streams that they'll be showcasing new cards