i find it odd that you are using cards that are not only expensive but not that great in the deck compared to other options. example being
Agent of Treachery, it looks ok but in practice it is a waste of mana. if you want to make a threat and remove threats just play
risen reef and some sort of ETB removal,
risen reef is not a threatening in the fact that it is a 1/1 but it is a VERY synergistic card and is usually how i win games( as odd as it sounds).
Risen reef can just end up getting you soo many lands that you just win from the value of your ETB triggers without playing something like
Avenger of Zendikar or
Master of Waves. this is me modifying this message after original post because i noticed you are not running
master of waves which you def should be, i would just like to say that you should probable research deck possibilities more because i see you are missing cards that are busted in a yarok deck. HINT there are alot of good ETB elementals. if you want to see an example i made a deck for a friend that i have yet to play but i made it using past experience with what is good in the deck and what is not, it is called Kyle's Yarok deck for Tyler.