We've also seen an entirely different Lord of the Rings card go up by 1000% in the past week
Unlike many effects that grant additional combat phases, you don't get an additional main phase with Godo, Bandit Warlord's ability
Descent into Avernus consistently creates more Treasure for you each turn, but it also creates it for your opponents
One your mana was doubled there were any number of ways to start generating massive card advantage and take over the game in short order, with Wrath of God serving as the four-drop to lead into the Wake and Mirari itself, which was usually the way things ended
The Creative team said they weren't staffed to create two planes in a single year (something we're equipped to handle now), so they suggested a story where something happened that was so impactful that it would allow for the complete shift in Zendikar's mechanics
JP UR (Ultra Rare) equals English Hyper Rare, the gold card