Changed Mega Mole
Many less enfranchised players reported they were a bit lost and had trouble connecting with the set. You can probably guess where I'm going with this, but since third's the charm, here are one highlight and one lesson learned from Unfinity: Some players appreciated that over half of the cards were Eternal legal
At the same time, the Hero deck required fewer lands, which meant that the Rat deck was more likely to get mana flooded (by virtue of needing to build with more lands in the deck)
It's just one more mana than Gilded Lotus but this is better - it's more artifacts for those decks that care about artifacts, it's indestructible, it can tap for multiple colors of mana rather than just one, and so forth
(2011-06-01) If there are no nonland cards exiled by Knowledge Pool, the original spell is still exiled
The neat thing about Rat Colony though, is that it doesnt force you to only use other cards with the same name, you can fit twenty of them into a Rat-themed Commander deck and not have to worry about not having enough other copies of it