During the last big fight between Vikas and Arshi, before he threw her into the pool, he said that when he gets his joker card, he'll throw Arshi out of the house.
That means the joker card would give him the power to evict a contestant.
Now I don't think he'll use that card to evict Arshi. Makers surely want to evict a contestant whom they can't evict based on voting because he or she is popular with the audience
So whom is he going to evict?
Is it Jasmin who is only surviving in the show because of her past fame? Maybe that's why they are calling her boring and all through Kashmira and Salman in WKV.
Or Abhinav who is somehow always getting away despite being tagged as someone who is not fit for the show?
Or even Rubina who is the most popular contestant, but not the chosen one of the makers?
Removing Rubina would pave way for Eijaz (the chosen one) towards the trophy, because Rahul and Jasmin are very much lost in the game and aren't going to survive for long if they keep going like this.
Whether its true or false is another matter, but Bigg Boss is giving this narrative for quite some time that Rubina, Jasmin and Abhinav don't deserve to be in the show.
If Rubina was their chosen one for the trophy, they won't be giving this narrative.
So they might just be setting a base for Vikas to remove one of the contestants among these three, to make it look justifiable.