Supposing that there are 2 billion children in the world, even if only an eighth celebrate Christmas and are good, that's still 250 million toys. Assuming the average kid gets 3kg in toys (that's about 6 to 7 lbs, for us American idiots) that's a mass of 750 million kilograms, or 750,000 metric tons. Since Santa's reindeer would need to lift that against the acceleration of gravity, they must be able to lift with a force of 7.36 billion newtons. Since Earth's circumference is 40,075 kilometers, the work required is 2.95*10^17 joules. I'll admit, though, this isn't totally accurate, as the load would be being pulled perpendicularly to the force of gravity, but I'll pretend this is just going to work.
To compare, a kilowatt-hour is 3.7 million joules. An average US home uses 10,000 kilowatt-hours of electricity each year. It would take almost 8 million homes running for a year to consume the same amount of energy.
But, that's for 9 reindeer. So, we can conclude that one reindeer can power almost 900,000 homes for a year. There are 131 million homes in the united states, so it would take about 150 reindeer to provide enough energy for the entire country for a year. Since 1 reindeer weighs about 200lbs, that is an amazing power to weight ratio. Antimatter is still better, but geez.
Reindeer are Gods.
