Bogles has 3 major parts and they need to be as cheap mana as possible. Hexproof creatues, power ups and card draw. You are missing the draw and your best power ups.

Cut 1 Hyena Umbra for another Unflinching Courage. That trample lifelink will win you games and 1 isn't enough. I suggest testing with 1 less Ledgewalker for 1 Heliod's Pilgrim. Sometimes you just HAVE to find another Etherreal. You'll cringe at the 3 mana every time.

Until recently I was playing a version very similar to yours. What I found is I didn't have Ethereal Armor on a creature turn 2-3, I lost. That meant it almost always had to be in my opening hand. Run Keen Sense in place of the Coronets. It doesn't boost power on it's own, but helps get you to more power. If you like Favors, cut 1 Favor and 1 Spider for 2 Keen and see how it plays.

Keep an eye out when playing or testing to see if Commune with the Gods would be good for you. I never tested them. Digging down to get something you need could be an effect your need.

Sideboard: Personally, I like Rest in Peace better than Relic. Partly because I had them on hand when I built the deck and it shuts down Dredge, Living End and Storm with no more mana needed. All of which I have in my local area. Grafdigger's Cage is also good as it stops creatures from coming in library's as well. It was more important with Pod, but it stops Summing Trap and Polymorph if they played in your area.

Maybe board: Battle Mastery is to expensive, if you need a 3 drop get more Unflinching. Mana Tithe is a decent sideboard card and is often unexpected. However, it loses effectiveness quickly. If you run into a lot of troublesome blue decks, Guttural Response is better. Local meta being what it is.

Hope this helps.