Unrealized cap gains is far worse than just that when you factor in catastrophic inflation. The inflation raising the price of everything towards whatever threshold they choose, will be like pushing a herd of buffalo off a cliff. Like being in Weimar, pushing your wheelbarrow full of worthless cash to buy a chicken and some bureaucrat says your wheelbarrow is now worth 500 million dollars and since you don't have enough cash to pay the unrealized capital gains your wheelbarrow must be seized.  

 Unrealized cap gains is just them rewarding themselves for destroying your currency.