Necropolis Regent, Avenger of Zendikar and Managorger Hydra are all inexpensive alternatives for creatures that will help you immensely in what you are trying to accomplish. You really should spend into Primal Vigor. It gives you an "Extra" Doubling Season. I run a similar deck to this. Here is the link in case you are interested https://tappedout.net/mtg-decks/ana-are-you-ok/

Thanks for the suggestions. I did think about putting Primal Vigor in the deck but decided to leave it out as it effects the whole field and wanted to avoid giving my opponents more resources to kill me with.

Oona's Blackguard

Thanks for the suggestion, I'll have to see where i can fit it in

Primal Vigor is super situational. YEs it does work for the opponent but most opponents are not running counter or token suites. I have ran it and never had an issue with it.

Don't get me wrong i'm aware that Primal Vigor is a good card that would fit this deck well but the players in my local play group's are running a lot of token decks at the moment. If this wasn't the case i would gladly put it in