I know this artist only by his pseudonym of "Prop Aganda." He's Greek, does art for all kinds of things, and would probably make one hell of a deck, if he set his mind on it. Check him out
Aubrey Beardsley was the first one that popped into my head! Glad to see I am not alone YAY
Everyone else I could think of has already been mentioned (Escher, Mucha, Van Gogh, Ernst, Waterhouse, Alan Lee, Goya, Dore, Ernst, Gorey)...except possibly Toulouse-Lautrec?
I'd really like to see a deck by Fiona Watson. She creates beautiful simplistic pebble prints. And stunning blue Angel etchings (I have one) and she does beautiful bird prints too, very detailed and colourful (I have one too) she would create a gorgeous tarot deck actually I might email her!