Check out the rest of the differences in start up as well as banned cards for Conquest if you're up to the test
A clever opponent might try and bait out your removal with a threatening double strike creature to make a more significant play later
Of note, these arent bonus sheets but they are subsets, though they lack their own set code, like BIG and OTP were for Outlaws of Thunder Junction
The only other ability of Carl & Russell is Outdoor Skills, which states that while this character is at a location, all characters at that location get an additional lore point when questing and gain Evasive
The Booster Box from this set, as a cornerstone of the MTG legacy, stands to benefit immensely from such developments
Additional Reading: First, I will introduce you to a neophyte's best friend: The Saturday School and Ask the Judge archives