@Phil Srobeighn  
My guess is either what you said or I need to edit one of the files somehow.

@Wiimeiser  
Well, sorry if you’ve seen it already and tried it, but at this point it all seems to point to something out-of-date in your base game files - or at least, that’s all I can think to do. Try re-downloading.

@Phil Srobeighn  
I’m getting the error:
 

 
Looks like it’s trying to do something MSE itself doesn’t support.

@Wiimeiser  
Yes, that’s what I used, too. If you can, enter a mana cost or select a color; whether you can or not, try going to the “Style” tab and adding chapter number coordinates and chapter divider coordinates, remembering to add a comma to the end of them. (For example, this card uses chapter number coodinates 195,278,358, and chapter divider coordinates 270,320, )
 
If you’re still having trouble after that, check the “Console” tab for any error messages; if you’re still having trouble you may want to redownload the template or post in the template thread (though you’re always welcome to ask me, I don’t know how much help I can actually be as I am a novice user as well).

@Phil Srobeighn  
Yes, I tried installing the Saga template here but it just creates a blank white void. I don’t know what I’m doing wrong…

(laughs in Champion of the Parish)
 
@FanOfMostEverything  
Nothing a few proliferate cards can’t fix. “Skip a bit, brother.”

@arcanedarness  
The sum. Note “total converted mana cost.” Similar principle to calculating the size of an Ancient Ooze.
 
And remember, those tokens have to live for two turns. Something as a simple as a well-timed Blazing Volley can ruin your whole day.

The third effect is not a tad too strong? Any number of exiles? With cmc less than a doubled amount of tokens? Or did you mean the sum of the cmc of all removed targets should be smaller than the amount of humans?

@Wiimeiser  
This card was made using Magic Set Editor; is that what you are using (and if so, which style/template)?

I tried making a saga but when I switched to the style it was a blank white void… I had to settle for using a planeswalker card to represent sagas…