Nature is always the workhorse for me, if I drop out of Mythic during the weekend I go back to Nature to climb back up. Have you tried Green Giant over Giant Pangolin? It's been my favorite since I've made the switch. Tough to kill and the confused doesn't mean as much since it has Overkill.
That's not a bad idea. Green Giant fell out of favor when Big Beast was the dominant nature deck. Other gods started running strong single-target removals like Ratify. Now that they have to tech so hard against wide aggro boards, the Giant could be a big problem.
Similarly, Pangolin was so good because it could help against other big beasts decks and guild enforcers. Those aren't quite as common now. Now, the overkill on Giant is more suited to clearing out zoo boards. I'll definitely try it.