2021-06-18 : A land that becomes an Island gains “{T}: Add {U}” and loses all other abilities. It loses any other land types, but it doesn't lose any types or supertypes, such as creature, legendary, or snow.

2021-06-18 : If Tide Shaper leaves the battlefield before its triggered ability resolves, the target land will not become an Island.

2021-06-18 : Tide Shaper will get +1/+1 as long as an opponent controls any land with the Island land type, not just ones named Island.