If you dont want to rely on milling from the top of your deck, there are great entomb effects like Buried Alive and Gravebreaker Lamia that help you to fetch cards to put in your graveyard
WotC generally supports rats more than mice (there are about a dozen rat commanders, and more than a hundred rats)
We'd like to finish off an opponent with as few fireworks as possible, though this ambition is complicated by the nature of multiplayer formats
Here are all of the Enchanted cards from Shimmering Skies revealed so far.
It shuts down other effects as well - your opponents can't cast spells from anywhere other than their hands, so no casting spells using Madness, Plot, Mayhem, or a whole bunch of red impulse draw effects
Those counters add up quickly, especially if you slap down Lae'zel, Vlaakith's Champion or something similar