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Conjurers Closet and Thassa, Deep-Dwelling will be some of the easiest ways to guarantee Lavinia keeps cheap permanents on lockdown, but having a suite of blink spells to back them up is never going to be a bad thing especially since it wont take long for Lavinia to become a priority removal target for the rest of the table

Landfall Retreat to Coralhelm is one of the best actual landfall cards ever printed and would be a slam-dunk inclusion here, but I also really love slightly different cards like Cosima, God of the Voyage and Trench Behemoth that do a lot of heavy lifting when lands are entering the battlefield with frequency

We also tried combining them in part or whole

Others prefer US prints for consistency or simply because they are more common in their area