Firstly, I'm really sorry I missed this one for soooo long.
Flo00 I like that this gives you stuff to do with little token creatures without getting out of hand. Green devils is new and probably the color I'd expect to see them in next (maybe).
melono There's a lot going on with this one. Giving two abilities based on other creatures at common can start to get complicated, so I like that you picked vigilance and lifelink. That they don't interfere with combat math is a good choice.
odivesco This is new. Collecting power to blast an opponent from dead creatures. Kinda swingy if they don't play a lot, really powerful in multiplayer. I do think I'd go with "X, T, remove X: deal X" as uncommon.
hydraheadhunter All in on non-blue and so many different themes! Four colors but uncommon. Can create (probably) 4+ tokens when it triggers but doesn't help you actually get the trigger. I think I just want a Nephilim callout to be... bigger. =)