There are certain ways to cheat your commander into your hand from the command zone, and Stegron, the Dinosaur Man is not worth the time to do so
Of course, Etali is also a Dinosaur, so it's a no-brainer inclusion in Gishath, Sun's Avatar, but I can also see it popping up in other Red lists including Xenagos, God of Revels, or even Yidris, Maelstrom Wielder
Which Avatar: The Last Airbender commanders are your favorite
You can make potentially huge tokens, remove artifacts and destroy enchantments, and for the finale, you can massively pump your creatures and give them trample
Arahbo, Roar of the World, gives a target Cat +3/+3 at the beginning of combat, meaning by turn two, with creatures like Sacred Cat and Loam Lion, you'll be able to attack your opponents with a 4/4
Orvar, the All-Form is another potential commander that rewards you when you target your creature with spells, in this case by copying one of them