Things that fail to generate card advantage, reliably or at all, will be much more generously costed
Oh yeah, and many Devoted Druid decks play Stoneforge Mystic and Kaldra Compleat as a backup plan
I should say that, for the sake of the video, "good" means that it showed up in the Top 8 of a Standard / Extended Pro Tour or Worlds event
A variety of creature-toolbox decks rely on Chord of Calling as an instant-speed tutor to find silver bullet answers like Reclamation Sage and Collector Ouphe to hamper their opponents, or to assemble value engines with cards like Yawgmoth, Thran Physician
Radha, Heart of Keld Radha, Heart of Keld puts an interesting spin on ramping by letting you play lands from the top of your deck
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