You play 1-ofs that make little sense to me, like Kytheon (he's a filler card, not highly competitive), Big Thalia is only decent VS Tron (and Amulet according to the situation) afaik. Maybe that's the meta you expect ?
Broodmoth makes no sense to me, it's expensive, while a card like Selfless Spirit answers more situations and can be vialed in or easily hardcast. But overall, Giver of Runes is the cheapest way you protect your dudes and is a target for Ranger. Your deck should accept to lose creatures to removal spells, protection is not as important as in Coco decks with a combo win, where you want to protect Walking Ballista for example. In your deck, Giver is also good because it helps creatures attacking through blockers (Humans lack evasion and that's a big problem).
Shelter is bad with Thalia in your deck. 21 lands is enough if you don't run 4-drops and 4 Vials anyway. To protect your dudes, once again Giver is the most synergistic.
Maybe there's budget considerations too ? I would consider 4 Cavern of Souls in this deck, but I know they're expensive.
Don't get me wrong, I can see you're experimenting a lot of builds, and I wish you loads of fun ! Just objective criticism here (from proven history of the cards).
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Pioneer - A bunch of stuff Modern - Humans Legacy - Grixis Phoenix / Death & Taxes