(It costs less to cast for each artifact you control as you cast it.) 7: For each artifact you control, create a token that's a copy of it
But, because the condition of cards is just as important as how rare the card is, most of the cards from back in the day are not worth very much
Definitely worth the investment
The other option is to take advantage of the direct damage, which is good in its own right to either finish off a damaged character or get them within range to be banished but also works with the likes of cards that benefit from being damaged - such as Scroop, Backstabber - that benefit from healing damage, like Rapunzel, Gifted Artist, or from damage being dealt: like Beast, Relentless.
Some cards from the Kaladesh set use energy counters to pay additional costs or buff cards
Also, people that trade online seem to be extremely picky about condition, and why shouldnt they