Thanks to Shift, you can play her for two less, which is always a royal bonus
Hajar can be that Commander, and at such a cheap initial cost to play, means you have no qualms about dropping Blasphemous Act, Chain Reaction et al to clear the way for your legends to connect
Modern dual land cycles like shock lands or fetch lands are more available, but still valuable because they are heavily played across multiple formats
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As for budgeting the deck, I tried to keep it around the $100 mark
You can do so fairly with their abilities or utilize cards like Tezzeret the Seeker and Voltaic Key