If you are fortunate enough to control one, its mana ability is available to you right away
Collaborations like Fallout and Hatsune Miku make for some of the most valuable and sought-after Bonus cards
Its also the best playoff for running villains if you manage to cast it and it survives, and the villain theme has plenty of support
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
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