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
It can be used both offensively and defensively (though a defensive Rift with no follow-up remains a bugbear for players everywhere)
Being an instant also lets you leverage the ability by holding up countermagic, card draw, or bouncing your opponents board states to remove all blockers before your turn
Rootha, Mastering the Moment Rootha, Mastering the Moment masters the moment by adding way more of them
This was the most popular of the four decks by far, and face Commander Ulalek was a big part of that
One example received a grade of CGC Pristine 10 the highest grade on the CGC Cards Grading Scale while the other received a grade of CGC Gem Mint 10