The idea of using cards as a fortune-telling device that foretells DOOM is less of a gypsy/tarot thing and more of a French tradition that was then appropriated into Voodoo Mysticism. In that tradition, the deck of 52 cards that we're familiar with is used, and the Ace of Spades usually meant bad luck. This was later exagerrated to mean CERTAIN DEATH in popular culture after the vietnam war when the Americans invading the former French colony assumed that the Vietnamese would be superstitious and started leaving aces of spades everywhere. You'll have to look up some voodoo witchcraft stuff or look into the bicycle deck style of fortune telling to figure this one out.
La Sandia O-o
There is luckily a short, handy guide I found on how this sort of thing works. There are apparently some more intricacies in this, but the Spades suit is the only one that always promises trouble outright.
I'm sure the ace of spades has enough prevalence of its own in literature, however. I remember in elementary school reading a pretty old book during the designated Slavery Unit where a kid and an old man were running away from a plantation, had their fortune told by a voodiferous woman who refused to tell their fortunes until they insisted, and then when they got the ace of spades card, the older guy straight up died in the next chapter.
Lay waste to all those who oppose you...
Same with the other one I wrote, if its confusing, just ignore me :P
May you see what life has to offer...
I'm sorry, had to just say that. If you get it, you get it. If you don't, just ignore me.