There are 12 Ken trading cards tracked on HobbyCardIndex, spanning Baseball, Amiibo, Disney, Other. The most valuable is the Ken [Black Foil] #67 at $50.50 raw.
Source: HobbyCardIndex · Updated daily · https://hobbycardindex.com/players/kenKen Cards
12 cards · Baseball Amiibo Disney Other
All Ken Cards
Ken [Black Foil] #67
$50.50
Ken
$17.99
Ken [Street Fighter Alternate Art]
$15.00
Ken [Rose Gold Foil] #67
$8.25
Ken #193
$8.03
Ken #225 [Animal Crossing Series 3]
$6.00
Ken [Street Fighter]
$5.49
Ken [Green Foil] #67
$4.83
Ken [Purple Foil] #67
$3.25
Ken [Aqua Foil] #67
$3.01
Ken [Blue Foil] #67
$1.39
Ken #67
$1.00