First of all, it costs more to cast than both, no matter what
It works great with cards you can repeatedly cast, like Whitemane Lion and Kor Skyfisher
You found yourself playing against someone elses tribal deck and decided you wanted to try it out or you just noticed that you had a lot of Goblins and wondered if a deck made up of just Goblins would work
We left it with 35 lands - we only removed a Forest and an Island from our mana base
Even if you arent building around dinosaurs specifically, there are plenty of cheap creatures with high powers, like Atarka Efreet, which become harder to kill thanks to Zilortha, Strength Incarnate
Skullwinder Skullwinder is a snake riff on Eternal Witness, on top of it being a 1/3 with deathtouch