Aria and Helix Pinnacle both set a doomsday device on the board and dare your opponents to disarm it before the world blows up and you spend the rest of your days stomping around with dinosaurs because all of the other Wizards are dead
And Elesh Norn doesnt care if you get hurt or one of your permanents gets hurt, so Protector of the Crown remains, at the very least, a free Fog with card draw on top
Also note that Guile is in the color of extra attacks, so if you have at least two charge counters on him you can cast Relentless Assault and deal 8 damage from your Sonic Booms and 8 damage in combat
What you do with the card with transmute: In Aaron's original version, you put the card on top of your library, which would then be shuffled in at the end of the effect
Or maybe a combo you think will break the game
He gives you an excuse to build around a wonderfully weird collection of bayou critters, and if your ideal Commander deck is a pile of Pests, Bats, Insects, Snakes, and Spiders slowly becoming enormous together, Blech is the perfect creature to lead it