Your opponents are going to suffer for tapping those Sol Rings, which is bad news when a chunky Menace creature is on the scene
Instead of tapping for a static three mana, it scales with your devotion to the color of your choice
Either you go goblins or you don't and either you get enough of the good ones to have a good deck or you don't
If an opponent plays Plague Zombies (while you have The Gudgeon in play), attacks with a zombie, and then passes initiative, if you break all their zombies, it is too late for them to take back playing Plague Zombies, so your opponent must take the Plague Zombie damage to their face
Okay, but why is it called The Rock and his Millions
This is neither mana ramp nor mana acceleration, but is a critical part of how white interacts with lands as it helps ensure you dont miss a land drop on your turns