Kels, Fight Fixer Kels, Fight Fixer handles two elements of sacrifice decks as a sacrifice outlet and payoff for other sacrifice effects
The Shadowmoor and Eventide sets both cared about the color of spells and permanents, so many decks had extra colors and used hybrid creatures
Kalemne, Disciple of Iroas Angels are going to get quite a boost from this guy as well as cheap cards like Boros Battleshaper
I think it's not really super exciting, but it does at least make it so people can play all the cool Spider characters from the set in a way that doesn't feel like you're just slamming them in a random 5c deck
Turtles Forever Often cards that give your opponent's the choice are not so good
Krrik is the only commander in cEDH that can run Diabolic Tutor and Beseech the Queen with a straight face, so a tutor with three black pips is a no-brainer