(And thats before we even look at the back half of the card, which will allow you to have access to infinite Jorns, at worst.) Jorn seems like hell do best in a mono-green deck
This legendary enchantment is fairly slow: It wants creature cards to go to your graveyard, but it only gives you two Squirrel tokens on your end step
As for Modern, Infernal Reckoning targets basically come down to three decks: Affinity (where Infernal Reckoning kills everything), Eldrazi (where Infernal Reckoning kills between everything and most things, depending on the specific build), and Hollow One (where Infernal Reckoning only kills Hollow One itself), although it does pick off the random creature finishers from traditional Tron decks like Ulamog, the Ceaseless Hunger and Wurmcoil Engine along with KCI combo pieces like Scrap Trawler and Myr Retriever as well
This red and green deck is centered around taking junk artifacts and enchantments and turning them into useful things, like indestructible 4/4 creatures
That will at least force the storm player to bounce this to our hand before they storm off, but this enchantment's activated ability is where the real value lies