The following decks have double-backer cards included:
White Ghost
Black Tiger (Red pips)
Black Tiger (Legacy)
Shadow Masters (Legacy)
Tally Ho Viper Fanbacks
Shadow Masters
SWE Green
Black Arcane
Black Ghost (Legacy)
Artifice Purple V2
Blood Kings V2
Roadhouse
Dealers Green
Artifice Tundra
Black Ghost 2nd Edition
LTD Purple
Artifice Green V2
Artifice Blue V2
Fathom
Arcane
Aurelians
Rounders White
Rounders Brown
Rounders Black
Infinity
Dealers Red V2
Hellions V2