A billionaire ex-premier plays poker against the junta chief, who has extra cards tucked up his sleeve – satirical swipes at the country’s chaotic politics are peppering Thai art galleries and social media with elections just weeks away.Headache Stencil – dubbed "Thailand's Banksy" – has led the artistic charge against the powers that be.His latest exhibition "Thailand Casino" which runs through the 24 March election, takes a hatchet to the junta and the power plays o