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It seems like a reasonable game plan which has decent inevitability
While Eladamri, Lord of Leaves from Tempest was the first-ever Elf lord printed, Elvish Champion from Invasion was the first one to provide a power and toughness boost
Now if the UG lands player doesn't have a sufficient landfall threat on the board, he or she can still find value in returning their lands to hand, discarding them for value (maybe to Wild Mongrel, Noose Constrictor, etc., or Turntimber Sower, if not Trade Routes), and having options to re-play them for future landfall triggers or other shenanigans
Instead of Incubator, try Herald's Horn or Vanquisher's Banner