Card Rulings:Water Gate - The World Ocean

-so basically, this card can accumulate the effect of "A legendary ocean", "Umi" and "Umiruka", but it cannot accumulate more than one of each. For example, if either player has two "Umiruka", a water monster does not gain 1200 attack points and lose 600 defense points (including Water Gate). It still gains 700 attack points and lose 200 defense points -If legendary ocean and umiruka is in the graveyard. Water gate can downgrade monster levels. Increase attack of water monsters by 900 points and defense do not decrease.