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Blood Moonutility$8.90Like Harbinger of the Seas, it turns nonbasic lands into something less functional and can heavily disrupt greedy mana bases. It is a stronger hate piece but in red instead of blue.Magus of the Moonutility$4.89This is the creature version of Blood Moon and performs a very similar nonbasic-land-locking role. It fits the same disruptive body-plus-hate pattern.Back to Basicsutility$3.56It attacks nonbasic-heavy mana bases by making many lands effectively unusable. It is not the same text, but it fills the same anti-nonbasic control role in blue.Sea's ClaimutilityBudget$0.16This enchantment directly turns a land into an Island, matching the core land-type transformation idea. It is much cheaper but narrower and less permanent in board impact than a creature threat.Spreading SeasutilityBudget$0.23It converts any land into an Island while also replacing itself with a card draw. It is one of the closest budget analogues to the Harbinger effect.Convincing MirageutilityBudget$0.16Like the source card, it changes a land’s type to Island and disrupts nonbasic utility lands. It is an older, more fragile enchantment version of the effect.Quicksilver Fountainutility$5.80It gradually turns lands into Islands, creating a similar mana-base disruption plan over time. It is slower, but the end result overlaps strongly with Harbinger’s role.Winter MoonutilityBudget$0.64This card punishes nonbasic-heavy decks by limiting their mana development, serving the same disruptive role even though it does not change land types. It is a strong blue control alternative.
