If there is no collector number, the card is probably an early printing, although Japanese cards continued to not display the number for a while longer
Though it may seem like an unusual Pokmon to make it to the list of the most valuable cards in the set, take a peek at the bottom of the card
Its free removal, it stops artifact and enchantment based combos when you have no mana open
Or for $50, you can get 10 Assassins creed cards with extra special art and extra shininess
Also Steiner is around $19 less than Cloud
So overall, if you are building a spread damage type deck, definitely use this line, other than that, I can't give this line more than a 2 out of 5 rating, both Litwick and Lampent were extremely poor and Chandelure can't pull those two 2 ratings up much