Harbinger of the Seas could spell disaster for non-blue decks when Modern Horizons 3 hits the shelves.

Blood Moon is among themost infamous cards in all of Magic: The Gathering, frequently nearing the top of lists of least-liked cards in the game. Now, Wizards looks to be spreading the pain across the color wheel, as a potentialModern Horizons3 leak has revealed a blue-mana version of Blood Moon.

Harbinger of the Seas is aModern Horizons 3 Creatureappearing in an unconfirmed leak of the set. We’ll keep you updated on the veracity of this leak, and if the card turns out to be legit, this Creature is set to make some real waves in the game.

Harbinger of the Seas can be cast for 1UU (one generic mana and two blue), and has the effect ‘Nonbasic Lands are Islands.’ The similarities to Blood Moon and its ‘Nonbasic Lands are Mountains’ effect are apparent right away, with fans christening the card ‘as ‘Blue Moon’, ‘Flood Moon’, and more.

While manymana-fixing cardslike Yavimaya, Cradle of Growth help with casting multi-colored spells by including text such as ‘Each Land is a Forest in addition to its other Land types’, Blood Moon and now Harbinger of the Seas bypass the ‘in addition’.

By turning each land into a single-color type, be it a Mountain or Island, these cards can completely lock other players out of their decks, preventing them from accessing the mana colors that their spells require.

While Harbinger of the Seas effect mercifully leaves Basic Lands untouched, it can still spell calamity for three to five-color decks. The more variety in mana a deck uses, the more likely it is to rely on Nonbasic lands. By locking all players into blue mana, Harbinger of the Seas is sure to besought after and reviled in equal measurewhen Modern Horizons 3 launches onJune 14.

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Jack Bye was a Games Writer on Dexerto’s UK team, specializing in ecommerce content. He is a Magic The Gathering and DnD expert, covering all things tabletop games. He also has bylines at WePC and VideoGamer.