High Tide

Instant

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

2010-03-01:
The delayed triggered ability triggers and produces {U} any time a land with the land-type Island is tapped for mana, even if that land has other types or the mana for which it was tapped is another color. For example, if you tap a Breeding Pool for {G}, High Tide will give you an extra {U}.
2010-03-01:
The effect applies even if the Island in question entered the battlefield after High Tide resolved.