Golos did everything, getting you a land to fix your mana to help pay for the commander tax and his ability, giving you free casts off the top cards of your deck
What it means is that people are willing to buy or sell cards based on four times the dollar amount listed on Troll and Toad (which is more or less equivalent to the exchange rate)
This is often called virtual card advantage, since it doesnt actually draw a card, but prevents you from wasting a draw step on a card thats otherwise useless
Take a Shining Charizard and give it an elegant pose on a light background and you've got yourself a winning illustration
These points can take a while to stack up, but it is one way of ensuring you get the card you want and completing the Pokedex
Hypergenesis has outrageous play patterns as a result, causing the card to get banned in Modern many years ago