Where Aetherling excels above most other cube cards is in reliabiliy
If you do rely on your commander, you need ways to protect it
Throw in a Coat of Arms and sink your opponents beneath your plague of rats
In order to help you along with your spell thievery, you get cards like Dream-Thiefs Bandana, which is a very cool new equipment that effectively gives you an extra trigger of Gontis ability, Cunning Rhetoric, which punishes your opponents for attacking you, and Heartless Conscription, which is a mass removal spell and exiling fuel for your gameplan
Like most Magic: The Gathering cards, the value of Pack Rat depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Return to Ravnica)
Thanks to flying and trample, Rakdos is a hard-to-avoid source of significant damage