The Legions design team needed to make creature cards which could fill the role of instant interaction, so the set has a lot of powerful morph and cycling triggers
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
PSA Representative: for SGC
One fun example of this is human tribal, led by the angel [c]Sidarda, Herons Grace[/c]
Thanks to this, there should always be demand for this rarest of the rare variant, keeping prices exceptionally high
More expensive ramp spells are thus weaker, though some might still find a home in certain decks