Of those, 2 of the commons have a lurking evil version that will show up 1 in 4 times you see that common
You would probably rather the extra Willpower, especially if you value the exert ability
Its never going to be atrocious (as its just a cantrip), but dont expect Legacy-level plays or anything
Experimental Frenzy can provide Mono-Red Aggro decks with an unheard of amount of card advantage, which is extremely scary for an opposing deck thats simply trying to stabilize
Outside of your strategy, stopping lifegain can be huge to stall many strategies
In the mainline games, Litten plays a crucial role as a starter Pokmon, providing players with early-game advantages against certain types and a pathway to one of the most formidable Pokmon in the region