When Dreadhorde Arcanist attacks, the player may cast an instant or sorcery card from their graveyard for free if its mana value is equal to or less than Dreadhorde Arcanist's power
No doubt losing Rage would hurt Mono Red especially, but Izzet Prowess doesn't need this spell as badly and its massive overrepresentation at the weekend indicates that this is the deck Wizards should be targeting the hardest
That can both get them into unfavorable battles, which is good for you, and clear the path so that there arent any annoying blockers
You can sacrifice them using the +2 ability, which will draw you additional cards, and in just three turns you can activate the -9 ability
The 60+ might just fit a double-sleeved deck in but we think a little extra space for pulls from a booster and some tokens from the 80+ is helpful
But it has two weaknesses that lack synergy here