The Mystery Booster reprinting should make it significantly less expensive if you need a copy for your Commander deck
The relatively high print run of Crown Zenith means that most of these cards are accessible compared to chase hits from harder-to-find sets like Evolving Skies or the early Scarlet and Violet expansions
In the old days you could cast Doom Blades until the opponent ran out of creatures, then they would topdeck some lands and blanks, and you could take over the game and use slow card draw effects like Jayemdae Tome to pull ahead
But most of the other color-fixing effects are actually ramp spells, which means they become too expensive to commit to in large numbers
Y'shtola Rhul Y'shtola Rhul requires you pick something to put into Conjurer's Closet every turn
Honestly, if youre doing Undercity, your curve should be more midrange and you should play more haymakers because finishing Undercity is too good to pass up on