The way it usually works is to sell your old cards for the price value bots or card retailers give and then reinvest that money to buy new cards
Even targeted removal will trigger their abilities from Nadu, digging through their library and ramping aggressively while pulling exactly the cards they need to win
When Horizon Spellbomb is put into a graveyard from the battlefield, you may pay G
Overall, it looks like you have reached a comfortable spot with how the deck performs so definitely feel free to ignore the suggestions, but I figured giving a few cheaper card suggestions couldn't hurt
However, that's not the case, as Ancient Tomb #91 is only the second most valuable card in the sheet
For example, Charizard cards tend to be more expensive than many other cards simply because fans love the creature