You can power down the effect and use Cryptolith Rite, but there's no need to, Earthcraft is already limited enough.
Fantastic, widely useful card. It's a tutor, it's instant-speed, not too expensive and allows decks to have more variety by combining go-wide with higher mana costs. Highly recommended.
Questing Druid is a red card, like Tormenting Voice or Faithless Looting. The creature is almost always a splash, since it doesn't trigger off green spells, I would say it leans more into blue than it actually does into green.