17 of your cards rotate, not just your two falkenraths. Consider Exava, Rakdos Blood Witch or put Scavenging Ooze mainboard at least. Also some removal such as Abrupt Decay or Putrefy would help make it more midrange-y, although it seems you want something more aggressive. Take out your old cards and put some things in that you have (considering the deck is at $360 mid price) you seem to have enough to trade for things like Rakdos's Return and whatnot.

Yeah these are just the cards I have now I am still working on it. I just thought vexing devil is hilarious with varolz. And I do have rakdos return and lord of riots. Which the more I think about it might be a nice card to have a couple in the deck

But thank you for the advice I will work on getting the putrefy an abrupt decay and the scavenging ooze. So I can have some life gain. I was also thinking about a few Brindle Boar so I can sacrifice it for life and then scavenge it.

its not as good but you could swap rancor for Deviant Glee

It's definitely a good place to start but I think I'm going to keep rancour in for a little bit longer but I have a feeling that theros is going to be a lot of fun with enchantments so I'm sure ill find a better replacement when it comes out but thank you so much. How does the deck look by the way. I know it's probably not tier 1 but I feel like it will be okay

personally speaking(im no expert so take all of this with a grain of salt haha) to what ive seen and been up against, you could probably do without corpsejack and varolz.CJ wont live long enough to be useful, and varolz just seems to be a contradiction to the ooze.i see experiment one having a hard time evolving more than once also.other than those i think the creature base is fine. Rakdos may be tough to get on the field,i think hes rad, just not so practical in a tri color deck. some removal will help ensure that your cacklers, trolls and oozes get through. hopefully theres some critters in theros that can provide synergy for lotleth troll. hope this helps!