Rat Colony gets +1/+0 for each other Rat you control, not just other cards with the same name
That said, always having access to the top card of the library is very useful, and there aren't a lot of cards that allow players to cast any card from the top
Following these rules can find a buyer as quickly as possible
Chromatic Lantern is one of the best options when you have a budget oriented manabase, but even with a perfect manabase, I love having the option to make life more comfy
Add in a few wincons like Stuffy Doll or Psychosis Crawler and then supplement the deck with card draw, bounce effects, and whatnot
came with plenty of fun, flavorful cards but they really flopped when it came to generating Energy