Its ultimate is well, a one-sided Armageddon that usually sends the target player back to the Stone Age
Even if you only get a few cards off him, he's a pretty good draw engine in a Jund shell, and even as a commander he can definitely do a lot of work - he restricts what you reasonably might want to use your removal on, but turning all your removal into cantrips is quite a scary thing when he also provides a reasonable win condition on his own
Killer Rabbit of Caerbannog Remember when I referenced the Monty Python and the Holy Grail killer rabbit
Maybe it's not groundbreaking to tell people Hammer Mage is good, but I'm not making the case for Hammer Mage here
It is a land when you need it to be which is already about the best mode any card can have
Goad Commanders are effectively kill-on-sight (save for Kardur, I guess), which, while the same for most new Commanders, is still indicative of how powerful Goad can be