If youre saving mana by casting one of these spells for free, thats another spell towards your storm count to get a bigger Empty the Warrens, Grapeshot, or Tendrils of Agony
You want to be able to win when things are not going perfectly, when you have an awkward curve, or when you are playing from behind

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It remains to be seen if thatll damage the finances of those mythics, but really, itll be all about Commander demand
An opponent might get out a first turn Jackal Pup, follow it with a second turn Dauthi Horror, and cap those off with a Mogg Fanatic and Dauthi Slayer on turn three, but your third turn Propaganda would ensure that you didn't take a full seven damage to the noggin on turn four