And the cost reduction actually matters for big tramplers like Balamb T-Rexaur and Coliseum Behemoth
In fact, there are even a subset of affinity commanders like Imskir Iron-Eater and Urza, Chief Artificer that use affinity to circumvent commander tax
Mutavault is powerful enough to see play in Eternal formats, and it looks like the only way they could sneak it into the set is by gatekeeping it behind a three-mana 1/1
Also exiling is the preferred method of removal for casual formats like Commander since it gets past indestructible things like Darksteel Plate, tricks like Heroic Intervention, and it permanently ends their threat, and they cannot be recurred
Rites of Initiation can also be particularly scary in a Squirrel deck
M20s Cavaliers M20s Cavalier cycle costs 2CCC, and theyre strong creatures that do something when they enter and when they die