In general, the idea of Dont fix it if its not broken, will never lead to any improvement or innovation
Cast one Relentless Rats and you may chain into a dozen more for free
If such a card comes out, that'll be another episode of A Holographic History of the Pokmon TCG.
Do I Really Have to Play Cumulative Upkeep
While itll take some reps to understand where and when you can go off, the how is relatively easy: make a bunch of mana with rituals, cast cantrips to run up the storm count, mix in a Past in Flames, and then put a lethal number of Grapeshot copies on the stack
Less competitive than Target and Walmart for cards, which sometimes means longer availability windows