"May Svyelun's waves drown your memory."
—Traditional merfolk curse

Dominaria Remastered

High Tide

Until end of turn, whenever a player taps an Island for mana, that player adds an additional {U}.

"Close the walls! Retract the docks! The homarids are coming!"
—Benson, Argivian sentry

"There's nothing like the high seas to clear your head or escape pursuers."

Vintage Masters

Until end of turn, whenever a player taps an Island for mana, that player adds {U} to his or her mana pool (in addition to the mana the land produces).

IDW Comics Inserts

"May Svyelun and her tides favor you."
—Traditional merfolk blessing

Masters Edition

Until end of turn, whenever a player taps an Island for mana, that player adds {U} to his or her mana pool.

"When the very tides turn against you, it's time to consider retirement."
—General Khurzog

Fallen Empires

Until end of turn, all islands produce an additional o
U when tapped for mana.

"May Svyelun and her tides favor you."
—Traditional Merfolk blessing

"By the time their enemies noticed the sea's changing mood, the Vodalians had often shifted formation and were ready to attack."
—*Sarpadian Empires, vol. V*