Having your buffs be card-neutral keeps your hand full and your interaction at the ready, and you wont stall out if your big tough creature gets zapped
In fact, its probably more useful to think of the archetype as Grixis Delirium and view the individual madness spells or graveyard payoffs as interchangeable tools that your discard engine can utilize
Now there's nothing to fear from blockers, or fog effects, and you can kill everyone without connecting, at instant speed
While players might not believe you at the start when you tell them you're using Kilo for a Jeskai Planeswalker deck, trust that they'll come around the first time Kilo is tapped to add a counter to Jace BelerenJace Beleren
Many quintessential Treasure cards are red
Solitude $60 Solitude is the last evoke elemental in this ranking (sorry Fury!), and is an incredibly powerful card: one of Magic's best removal spells, one of the best lifelinkers, and overall among the strongest white cards in the game