This means that you can effectively untap mana rocks such as Sol Ring or Mana Vault or loop powerful enters-the-battlefield triggers such as Dockside Extortionist or Spellseeker
Whats even better is that some Rooms are actually removal, such as Cramped Vents // Access Maze, Glassworks // Shattered Yard, and Restricted Office // Lecture Hall
(This is in a game where tempo is a big concern.) Other times you'll need to be very patient and save your Dissolve for some devastating threat your opponent might have, which you can't answer in any other way
Purple's identity as the "big DON
But then I saw the decklist, and I was right back out
Once it has all four abilities, the Ring can still tempt you and you can change Ring-bearers, but no new abilities will be gained and no old ones will be lost