"Game of Thrones" season 7 will feature the Iron Bank representative Tychos Nestoris on two episodes from the remaining seasons. Tychos Nestoris is played by the actor Mark Gatiss. Just like Sophie Turner, Gatiss just spoiled that his character will be at least alive for the next two seasons.
For a recap, Tycho Nestoris is the rational banker from season 4 and season 5 that works on the Iron Bank. He believes that numbers are more important than words because numbers are less deceiving. His first ever appearance on "Game of Thrones" is in the episode "The Laws of Gods and Men" from season 4. It can be remembered that his second appearance is in season 5's "The Dance of Dragons" when Mace Tyrell has traveled to Braavos to sway Nestoris about the debt of the Crown which did not work. "Game of Thrones" season 7 might emphasize how important the Iron Bank is in the series.
Gatiss has revealed tidbits of information about his character in an interview at the BFI & Radio Times Festival as reported by Winter Is Coming. The "Sherlock" writer stated that he cannot say more for this matter as he doesn't know anything yet. What was sure is that his character will bring interesting happenings caused by the Lannisters' debts. Gatiss also revealed that Tycho Nestoris will not only appear on "Game of Thrones" season 7 but he will also appear on another episode of season 8.
So what does Tycho Nestoris' appearance implies on the show? It means more Braavos and more Iron Bank, as reported by Vanity Fair. With the fact that the Lannisters' gold mines ran dry and Cersei is the current Queen, she will be forced to pay the Crown and her family's debt to the Iron Bank. The Iron Bank has been seen before to do whatever is needed to take their money back. Cersei might see her defeat in "Game of Thrones" season 7 with the Iron Bank funding her enemies to take her down.