MH2 has made big strides to turn a beloved but underdeveloped tribe into something that can hang at your low-mid power Commander tables, adding a bunch of Squirrel Tribal cards into the set, most notably the first "official" leader with Chatterfang, Squirrel General
This article is based on my old Reddit post and is a collection of information and posts on this subject together with my own experience
While some 5-color commanders have a clear theme, like The Ur-Dragon or Sliver Overlord, others offer a bit more flexibility, like the new Omnath, Locus of All
It starts off as a 5/5 menace for three mana since you discard your hand on entry, then it's just a matter of keeping your hand small enough to maintain that statline
Speaking of Commander, the Citadel is a notable commodity in Group Slug shells that focus on dealing as much damage to all players (as opposed to Group Hug decks) and generally playing annoying cards that will make everyone mad at you
I like this suite better than one shots for a few reasons