Oooh, if you're going to spank Oanda, I'm in luck! I already have an account with them. I also used my credit card, and it seems fine on my end, so it should be cool to use.
They "only" allow 50x leverage though, so dunno how that would affect this... contest? we're having here. Canadians do have a leverage limit on currencies, but as I would be using Eur/Usd, then I at least have access to 33x if we're going the route of excessive leverage here.
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Btw, I think it's a bit of a good exercise to attempt to get a winning account to go exponential. On demo, though! $100 may be ok for live money, but don't get hooked on that, lol. You'll burn out shortly.