At common, we only included a handful of typal cards, and they all had a threshold of one, meaning that to optimize them, you only had to have one creature of that type on the battlefield
Saryuja Skull Dread This is a versatile card, but doesnt do a whole lot of favors for the deck
Loot has three different Exhaust uses, all tied to its color identity - the Green one adds three mana of any one color to a player's pool, the Blue one allows the owner to draw three cards, and the Red one deals three damage to any target
Jar may not be the strongest monster in existence, nor is it even THAT good at being indestructible by battle
It's impossible to say with any kind of general certainty whether Japanese Pokmon cards as a whole are worth more than English ones
EX : Delta Species Set | PokCardex