Vince's answer is good, start there. Note: If you agree to using Card Decks method and want to save some time, there are 2 good Tarot Card Decks for sale from Roll20 Marketplace. Those install instantly into your game, ready to work. Oosh's answer is a creative alternative, almost a hack rather than a Roll20 feature (especially in light of using external image hosting, where you need to be able to control the Filename/URL). Functional idea, I'd like to give it a try. If you still want it to be in Chat of your own design, look into Rollable Tables. Rollable Table feature can randomize & display images in chat. You can easily repeat the Rollable Table roll, 3 times to get 3 cards. When you make the Rollable Table, you'll have to put ONLY the card image, do not put a word or title in text per-card. You want the output from rolling the Rollable Table, to be the card image. Unfortunately rollable tables currently do not output the Picture AND the Text, it's one or the other, so for Tarot Cards do the images. Here's a macro for ya! Something like this: /me LAYING DOWN THREE TAROT CARDS:
[[1t[Tarot-Cards-Table]]]
[[1t[Tarot-Cards-Table]]]
[[1t[Tarot-Cards-Table]]] How did I do? Can I get a reading? But maybe this: /me LAYING DOWN THREE TAROT CARDS:
[[3t[Tarot-Cards-Table]]] How did I do? Can I get a reading? Have fun.