Knowing when to be aggressive and when to be defensive
If you don't have the required number of permanent cards in your graveyard at that time, the ability won't resolve and none of its effects will happen
(My approximate reaction.) Bear Cub mightve been a functional reprint of Grizzly Bears, but at least there werent grand promises thrown around about half the set being all new cards
Surely Wizards R&D never printed a spell that lets you reanimate a bunch of enchantments all at once
Meanwhile, on the less monstrous side of things, the more human-focused forces of Innistrad might have the ability keyword Coven, which can cause a unique ability if you control three or more creatures with different powers when its triggered
For the uninitiated, Commander is a semi-casual format for Magic: the Gathering, where you use a deck of 100 cards led by a legendary creature, your Commander