While this is a serious restriction on the mechanic (itd be much more powerful if you got a benefit every time you played a spell), this restriction allows cards to be more aggressively costed
You can also lean into Izzet and take advantage of double strike + connive + combat tricks on an unblockable creature
While X spells don't always thrive there, given the prevalence of "cast without paying its mana cost" effects that like to cast them for zero, many consider ElectrodominanceElectrodominance worth the risk because it allows you to burn an opponent out with all the mana you've acquired from your rituals, then tack another spell on to continue the process for others
Meanwhile, if possible, it's usually best to try to cast Tainted Indulgence and Thirst for Discovery during our opponent's turn since either one will draw us at least two cards, triggering all of our payoffs
If your commander dies, you can pay life instead of commander tax, so recasting it isnt a big deal