Shield, Tower Shield, Emerald Shield, Jade Shield, Ice Shield, Permafrost Shield, Mirror Shield, Hope (1+ light-emitting creatures or upped), Solar Shield/Buckler, Skull Shield/Buckler, Wings, Dimensional/Phase Shield, Bone Wall, Dissipation Shield, Dissipation Field, even Dusk Mantle and Fog Shield to an extent.
Those are all the disadvantages this+Dune Scorps has versus Momentum+Dune Scorps. Plus, Momentum is one of the most powerful effects in the game. Maybe a +1 cost increase, if anything?