and along with other two-for-one cards like Force of Vigor, they are some of the most powerful cards in the game: they offer instant-speed interaction for no mana
First, you can look at the top card of your library any time you want, so that works with things like Soothsaying and Sensei's Divining Top
Sapphire really is getting some great new tools
Still, its hard to go wrong with a versatile charm effect, and all three of the Bant-aligned charms have their uses
Other entries rely on having big creatures, the higher the power and toughness values the greater the number of cards drawn
(I havent actually played with this, so its possible Im overrating it, but probably not by much.) Maw of the Obzedat: This guy just makes everything a nightmare for your opponent