The ability of damaging planeswalkers just doesnt do enough for me over the metric of dealing damage. This card is mostly for Cubes that are really heavy on planeswalkers or are just at a larger size
For example, if Prowler is blocked by a creature with 4 power, and then an effect gives that creature -3/-0, it won't stop blocking Prowler
Landfall The lovely landfall returns represented on several cards and for examples, I call up Final Fantasy 8 s Zell Dincht, Final Fantasy 13 s Sazh's Chocobo, and Final Fantasy 15 s Gladiolus Amicitia
To really get into it and mix things up, though, well need the other colors for assistance
While that doesn't negate all its other abilities, it just feels weird to have this flavor word on the card that doesn't really do anything in Standard or Limited formats