Many cards break into the 3-figures if they're not printed enough, like Power Artifact, and its not uncommon to get into 4, 5, and even 6-figure price ranges for the ultra-rare
These creatures can make a really big difference in game play, which is often worth the extra cost
I don't know what kind of a shell Tezzeret, Master of the Bridge might fit into, especially considering he costs 6 mana in Modern, but I could easily see two or three of his +2 activations winning the game with the way artifact decks in Modern play out
The first is to buy a copy of the Challenger Deck and then spend about $100 to pick up the missing pieces for the tier build, giving you the fully powered deck for about $140 (compared to the $180 price tag if you bought it without the help of the Challenger Deck )
This decision contrasts with the banning of Fury late last year, widely considered a thoughtless move
Serialized versions of Mox Jasper can appear in Collector Boosters of any language, but the card will always be in English
