Sprigatito is classified as a 1-Diamond card in the Shining Revelry set
Old heads like me back when the Pokmon game and the show came out in the 90s, so we have people 30, 40 (years old) that were into it then, Harry said
It's a very Commander-esque ability in hindsight, but the design team didn't even think of a Commander format at the time, and they wanted people to build decks around it, so it was intentionally a non-legendary creature so they could take multiple copies out on the battlefield
Bulbapedia is usually pretty stubborn about only including official information, even to the detriment of their website, but perhaps this predates their rigidity
Urza holds an important place in the story as a character, so we knew a planeswalker card of him had to be a big deal
Its hard to recommend the all-gold Mega Greninja ex - 120/083 - its a gorgeous card, but the price is steep