At eight mana each, they're massively overcosted now of course, especially because you have to pay mana each turn to keep them on the board
Red offers multiple creatures (Guttersnipe, Thermo-Alchemist, Firebrand Archer, Kessig Flamebreather, Electrostatic Field, etc.) and enchantments (Descent into Avernus, Oath of Chandra Valakut Exploration, Dragon Tempest, Impact Tremors, etc.) that dish out repeated damage with a bit of extra work
Collaborations like Fallout and Hatsune Miku make for some of the most valuable and sought-after Bonus cards
Casting a Veil of Summer in response to a Cryptic Command was truly backbreaking, but its less powerful when you cast it in the face of a Counterspell and your opponent simply responds by casting another one
It was a powerful intoxicating deck