Hey there artakha! Thank you so much for the comment and I do apologise for the sheer length of time it has taken for me to reply to your comment! It is a very meaty comment and I love having so much to consider :D! Here are my thoughts:

Worldly Tutor : Now here is a non-permanent spell with CMC lower than 3 that I would actually consider... if it was legal in modern :(. Fantastic card but for my own reasons I would prefer to keep the deck modern.

Silent Arbiter : You make a great point here. I think a less threatening alternative could be used here for multiplayer (e.g. Lightmine Field ) but in both multipleyer and 1v1 Silent Arbiter might be better side-boarded and brought in for aggro deck. What are your thoughts?

Sublime Archangel : For whatever reason, I have always had Elspeth and Sublime Archangel take up the same spot in my deck in my mind. I guess there is no reason why I can't have both; especially if I put Silent Arbiter into my sideboard.

Dawn Charm : No doubt this deck does not like board removal. I think my only form of defence to that has been being able to build back up faster than my opponent. Though this deck lacks any real card draw mechanics. While I can see the potential of Dawn Charm, it does not synergise with my Plea so I am not really taking to it :(. Perhaps something like Ghostway could work however, or Sphinx's Revelation to draw those cards. What are your thoughts?

Overall, thank you so much for the suggestions, I have a lot to think about and some deck changes to make :P!

You deserve points right off the bat for not pussing out and running Goyfs.

Also, I hope you get some fetch lands soon. Those Expanses aren't going to cut it.