Its an ability doubler for abilities that trigger from casting spells, which includes prowess, magecraft, and anything else that says when you cast an instant/sorcery. I like that this plays an aggressive game plan but still feels very much Izzet, leaning into prowess and spellcasting to get the game over with
The bigger question is whether being a creature rather than a noncreature artifacts like other sideboard hate cards is drawback or a benefit
Of course, Id argue there are even two tiers below it if more grading companies are included: E for less popular but still reasonable grading companies, like GRAAD (Italian), Platin (German), CGA/ARK (Australian), EG (Spanish), etc
Why This Raichu Is a Shockingly Good Addition: Flawless Condition: With a CGC 10+ PRISTINE grade, this card is in immaculate condition, boasting perfect centering, sharp corners, and a flawless surface
But its Artifacts that are the cream of the crop when it comes to historic
Solemn Simulacrum has to be here