Not having to take a creature from the milled cards, and instead choosing anything in your yard
While the set also hid Memory Lapse and Merchant Scroll, a lot of players found the hidden gem in the set: Serrated Arrows
You'd totally get belly rubs if it wouldn't singe my hand
You can always "bracket decks up," meaning you can note that your deck meets the description of a Core (Bracket 2) deck but plays like an Upgraded (Bracket 3) deck, so you should bracket it at Bracket 3
With this in mind, its in your best interest to ensure that the final ability never comes to fruition, which is easy with self-mill effects
Best Cards: Chitterfang, Squirrel General: Probably better than Hazel in many squirrel decks, Chitterfang is still the definitive Squirrel commander