Give
Dawnwalker or
Snapping Brushstalker repetitive killer to repeatedly kill enemy units at no card loss while playing big beefy time threats.
Nightfall does a lot of work in this deck, because even though you're giving your opponent a card, the repetitive and difficult to remove nature of Dawnwalker/Brushstalker means that you will make your own deck more consistent and gain card advantage over the opponent.
Woda is the weakest card in the deck, might replace him with a third
Amaran Stinger (great synergies with early nightfall/
Teacher of Humility) or a third
Worldbearer Behemoth (good statline, solid dino).
For the market, predator's instinct is there if you can't find a killer effect. (There is 5 in the deck, merchant basically guarantees 8 copies), waystone ignitor or swirl the sands for enemy relic removal. Grodov's Burden lets your deck go crazy if you've ramped to 6 or 9.
Basically never use waystone fragment, not sure what to replace it with.
This is a pet deck of mine that I really enjoy and I've not really seen anything similar played on ladder.