But what Flusterstorm does shore up a glaring vulnerability of permission decks: Tendrils of Agony
Kess, Dissident Mage is essentially a better version of him (you can't cast instants on opponents' turns), but cheaper and has access to Red
Leave it to Modern Horizons 2 to have a gem of an uncommon in Herd Baloth, just waiting to generate tons of beasts with all of green's +1/+1 counter play
And since mana screw and mana flood are two of the more annoying aspects of Magic, anything that allows you to mitigate should be encouraged
His card starts out as a simple looter, but get 14 cards into your graveyard (get it?) and he flips into Hades, a mighty avatar that lets you play cards from the bin
Or maybe you want the Elven Council deck, and force your table to do a whole lot of voting