Looking at my cube, there is critical mass for: Goblins (R) Humans (all) Warriors (WBR) And, with some effort, other tribes could get critical mass running only cards that are cubeable by themselves, keeping the Poison effect to a minimum: Soldiers (W) Wizards (U) Shamans (RG) Vampires (B) I'm fine with dedicating 2-3 slots per color so each of these tribes have a Lord or some other linear effect as a nod to play them (Goblin Chieftain, Champion of the Parish, Chief of the Edge) but I don't want this cube to be mainly tribal, just have an extra layer of synergy that cares about the creature type line at a low opportunity cost
No Secret Is Hidden from Me Scheme When you set this scheme in motion, exile cards from the top of your library until you exile a nonland card
Truly a gruesome and awe-inspiring monstrosity
Shambling Cie'th's ability resolves before the spell that caused it to trigger
Keep in mind that many token creatures dont have abilities either, so you can take advantage of token generators in a Jasmine Boreal of the Seven deck, too