Michael Saylor, founder and executive chairman of MicroStrategy (NASDAQ: MSTR), is arguably one of the biggest Bitcoin (CRYPTO: BTC) bulls on the planet. Ever since his company started aggressively buying Bitcoin in August 2020, he has predicted that the price of Bitcoin has nowhere to go but up. He now thinks that Bitcoin could hit a price of $13 million by 2045.

At the end of October, he delivered more welcome news for Bitcoin investors: the launch of a spectacular $42 billion Bitcoin buying plan during the next three years. That's roughly equivalent to 3% of all Bitcoin in circulation, and it could set off a huge Bitcoin rally for years to come.