While I don't think the Cardinals will add both Nola and Snell, that doesn't the Cardinals shouldn't be looking into both of them.
Snell brings great postseason experience, including the 2020 World Series, and is a strikeout machine, averaging almost 12 per nine innings. John Mozeliak has to find a way to land one of the two aces on the market, and Snell would certainly fit the bill for St. Louis.
The left-hander and former Cy Young is 8-8 with a 2.50 ERA this season with the Padres. He also brings some competitive fire to the clubhouse, which would benefit the Cardinals greatly.