There are unicodes for the cards, e.g. πΆπ. Does slack support color text?
Re:Slack Poker Bot
by CharlieHess on Tuesday September 01, 2015 @04:59PM
(#10155695)
Totally considered this early on but wanted to stick to card images to add to the authenticity. Might expose this as an option later on, though.
Why not define a bunch of custom emoji, one for each card, and use those instead of the big graphics at each turn? Would save massive bandwidth.