Resource reliability
The bigger a format's card pool, the less impact new cards will have (on average) since only a few are strong enough to matter, thus partially shielding these formats from the Too Many Cards problem
Then each player who searched a library this way shuffles
Stegron the Dinosaur Man and Double Trouble can increase the cards power even further, though this only lasts until the end of the players turn
Full stop, I believe that Galadriel, Light of Valinor is one of the best, if not outright the best, creature-based goodstuff commander in her colors
Its commons are particularly standout, as even after the top three above you have strong cards like Emergency Weld, Carrion Locust, and Ravenous Gigamole among others