The host himself, Justin "Kredible" Willman has appeared on several magic specials and played a magician in the episode "Alaka-Scram!" on The Suite Life on Deck. This isn't even the only competition show Willman currently hosts: he's also on Cupcake Wars over on Food Network.
Keep Circulating the Tapes: Convy's episodes reran from 1990 to 1992 on USA Network, and 2002 to 2004 on GSN. The three other versions haven't been seen since their original airings. Somewhat ironically, VH-1's I Love the '80s series showed clips of the NBC version...and only the NBC version.
Several weeks of the Bert Convy version were missing in action on GSN, possible due to celebrity clearance issues. Clips of them were shown in early GSN promos. They included Sally Struthers and Vicki Lawrence vs. Ed Marinaro and Charles Nelson Reilly, Charles Nelson Reilly and Burt Reynolds with two unknown female celebrities, Loni Anderson and Martha Raye with two unknown male celebrities, and Edie McClurg and Donna Pescow vs. Pat McCormick and Paul Williams.
The only way to see reruns of the 2014 Disney Channel revival is on YouTube or file-sharing sites.