The penultimate season of Game of Thrones is coming to an end and there are a few things fans want to see happen before the season comes to a close. Mainly, most viewers are ready to see Littlefinger meet his demise in the finale. But could Littlefinger really die on Game of Thrones? People certainly hope so.
Over the course of the series, Littlefinger has successfully manipulated his way into power. He's killed and betrayed people, and has somehow, seemingly, gained Sansa's trust. However, many fans are hoping that the Stark sisters are actually working together and playing Littlefinger, leading him into a trap he can't escape from.
In the past few episodes, Littlefinger's plan to turn the Stark sisters against each other seems to be working. He purposefully planted a letter in his room for Arya to find that would make her suspicious of Sansa's loyalties. The letter was one Sansa was forced to write back in Season 1, in which she pleaded with her elder brother Robb to end his rebellion against the king and swear fealty to Joffrey.
Though Sansa tried to explain that she was forced to write that letter (and Robb saw the letter for what it was, so it didn't change anything), Arya wasn't willing to listen. She even called out Sansa on trying to usurp power from Jon while he's away.
Even so, towards the end of "Beyond the Wall," Arya did something that has fans convinced she's actually working with Sansa to kill Littlefinger. After Sansa discovered Arya's bag of faces, Arya challenged her to play the lying game. Though Sansa didn't want to participate and seemed legitimately frightened by Arya, who began twirling around the dagger Bran gave her, in the end Arya simply handed over the knife to Sansa.
The knife has a long history tied to Littlefinger. It was the knife that was used by the assassin who attempted to kill Bran in Season 1, which led Catelyn to go to King's Landing looking for answers. Littlefinger claimed the knife belonged to Tyrion at the time, leading to the feud between the Lannisters and the Starks. However, the knife never actually belonged to Tyrion and many fans believe it was actually Littlefinger who sent the assassin to Bran to incite the War of the Five Kings.
Bran seemed to hint as much when Littlefinger gave the knife to him. Bran repeated Littlefinger's own words, telling him, "Chaos is a ladder." The fact that Bran then gave the knife to Arya who then passed it on to Sansa, definitely seems to imply the weapon will be used to kill Littlefinger. Bran can tell the future and if he actually believed one of his sisters would use the dagger against the other, he wouldn't have given it over.
It's more likely that all the Stark siblings are working together to take out Littlefinger with the same weapon he used to incite the war that killed off the majority of their family. What better revenge is there than to die by your own weapon?