Fastest Investment vehicle for a short-time frame?

[Argent Cove]

Hypothetically - I was just diagnosed with a terminal illness. I have exactly 2 years to live and only $50k to my name. I want to swing for the fences (I don't care if I lose it all) on 1 last investment. I know it may be a gamble but I can only invest in 1 thing. I'm out of time. The goal is the biggest win possible. What should it be?