Blue Card Mechanics

Isn't "Harbinger of the Seas" a card that completely deviates from the range allowed for blue?The effect of "Blood Moon" is essentially land destruction, and that should be allowed because it is red. Just because Spreading Seas is in blue, allowing it to have that effect on the big picture would be an anomaly that would allow Jokulhaups and Armageddon in blue.　I'm not sure how the Council of Colors could have allowed such a card? If blue allows such a card, white and black should pass this effect before it, and if green allows it because it can, then green will be allowed to have a creature with both death touch and fighting.This card is too ridiculous.

Blue is primary in turning lands from one basic land type into another. It’s not an effect we do a lot, but when we do it, blue is the one who mostly does it. (We do let black turn lands into swamps.)

Armageddon Black Blood Blood Moon Blue Colors Council of colors Creatures Green Harbinger of the Seas Jokulhaups Lands Mechanics Primary Red Spreading Seas White