The biggest thing in my mind for not ranking Izoni higher is that if you get behind on the board, and can't attack or pull creatures from your graveyard, this commander has a hard time recovering
So, in a three-color deck built around red, white, and blue, aka the Jeskai colors, an Arid Mesa can fetch up a Raugrin Triome, which is a nonbasic land with the mountain, island, and plains types, and subsequently taps for all three corresponding colors
Play it in a slow deck, like this one
Compare this to Phyrexian Arena
Sure, that creature will break the rules a little bit and still attack your opponent every turn, but its the thought that counts during the holiday season