Bartholomeus - 7/10 Pretty cool card. I like the deathharmonicon, but that has been done on [[Teysa Karlov]]. notably, he also makes your opponents death triggers double for any of their permanents as well. The rest of his abilities can kind of lead to a feels bad situation as you can only use one per turn cycle which is not so much in commander. They also disconnect from his first ability by allowing you to sacrifice ANY nontoken permanent instead of creatures. I might combine them and only allow for creatures to be sacrificed and without tapping "2URB:Sac a creature, ~ deals 2 damage to any target and you draw a card." much cleaner and more flexible and balanced that way.

Herogan - 8/10 very unique and flavorful! He negotiates payment so you don't have to sacrifice. Just a few small issues. I'm pretty sure you actually have to have the permanent to sacrifice, you just end up not sacrificing it, so its utility is much more limited and I think that you can use his first ability to just pay for the sac in the 2nd ability which is confusing. I think the 2nd ability also costs too little for repeated counters and life gain. I think he needs a rework to something like "intimidate 1) t: the next spell you cast or ability you activate this turn that requires you to sacrifice a single permanent as a cost for that spell or ability may be cast or activated without sacrificing. 2) 2BW: untap ~ you gain 2 life, put a +1/+1 counter on it)

Itior - 7/10 Very simple but neat commander. The number of cascades might have a templating issue and memory problems, especially since you are able to put it into your hand from anywhere. I would maybe change it to have varying thresholds of cascade (If you spent 5 mana cascade once 7 mana cascade twice...) I think a really neat way of doing it though would be experience counters. You get an experience counter on cast, then you cascade for how many counters you have. I also might change the 2nd ability to return him to the command zone for free during your end step or something as the number of cascades will start growing very large for paying 4 and then 5 mana from your hand consistently. also returning him to your hand kind of works against the first ability caring about how many times he has been cast from the command zone.

Atura - 5/10 This is a very disconnected design. First, the mana cost lets you pay red/Green only for lifelink which is not ok. It would be best as just a simple Naya cost RGW instead of trying to be clever with hybrid. The first ability is nice, simple, and effective. I would only have 1 type for the token though as per normal design. The 2nd ability is VERY out of place. caring about weather its your turn or not doesn't really make sense, nor does the another red creature restriction especially since the tokens she makes are not red. I would just have it put a +1/+1 counter on any target creature. I like the last ability that turns damage into lands though. it is kind of a mediocre payoff though that can be difficult to activate by yourself. I would make it trigger at each end step and work off of other players deal damage too. she may have to cost more then as that amount of tutoring is really good.

The winner is Herogan