There is a possibility Thrumming Stone whiffs, but the odds of that are really low with how many copies of Rat Colony will be in your deck if you build your deck around the combo
For example, if you control Traveling Chocobo ("You may play lands and cast Bird spells from the top of your library.") and Jidoor, Aristocratic Capital is on top of your library, you can play Jidoor, Aristocratic Capital, but you can't cast Overture
Thats a huge upside compared to Relic of Progenitus once you can afford to crew it
For starters, we're returning to the bumper crop of five decks of old, with, as you'd expect, one deck focused on each of the clans
The problem with Smoldering EggSmoldering Egg is two-fold: One, seven counters is a lot of counters to pay off into a simple GuttersnipeGuttersnipe