In the mainline Pokmon games, Arcanine is typically obtained by evolving Growlithe with a Fire Stone, a mechanic that has remained consistent across generations since its debut in Pokmon Red and Blue set in the Kanto region
You could have one deck for the classic Peter Parker Spidey and his supporting cast, one deck for the Spider-Verse ensemble, a villain deck starring the Sinister Six, and a Venom-led deck featuring all the symbiote characters and some other morally-flexible folks like Kraven the Hunter
There are also a few cards that count as whatever creature type you need for your party, like Stonework Packbeast, Tajuru Paragon, and Veteran Adventurer
Adds value to cat-oven, Priest, Chandra, and Woe Strider
Giving +1/+0 to creatures permanently is very nice, and you can make them fight another creature or bypass counterspells