Marlo, Ed: Those Wild, Wild Aces ©1971 Edward Marlo, Magic Inc., Chicago, IL Softcover, 8.5x11", 7 pages

Image courtesy eBay seller kahoren

Comments: A Red-Backed Ace and Four Blue-Backed blank cards change to one Red-Backed blank card and four Blue-Backed Aces. I believe this originally came with the gimmicked cards.

Contents (courtesy Denis Behr's Conjuring Archive):

1 Those Wild, Wild Aces: two methods
5 The Wild Deck: four Aces removed from deck become blank, then the whole deck
6 Blank Ace Assembly: idea