In Fate Reforged, there is a card called Shamanic Revelation which costs only one more colorless mana to cast than Harmonize did, but has far more potential for some serious card draw. Plus, it even has the potential to offer life gain.
Shamanic Revelation considers how many creatures you control, including token creatures. Green based decks tend to field a great many creatures, so it's most often going to be the case that you will be drawing at least 3 or 4 cards whenever you play this card. Plus, this card also features the Ferocious mechanic, an extra effect that activates whenever you control a creature with power 4 or greater. For each creature you control with more than 4 power, you gain 4 life.
While life gain may not be considered one of the most consistent mechanics out there, we've seen in past Constructed formats how cards with built-in life gain can greatly affect a competitive format. Gaining 4 life here or there can decide games, so the second half of this card is very relevant.
In any case, this is basically a more powerful version of Harmonize. With how quickly Green mana tends to ramp mana, 5 mana isn't much of an investment for the value of the card draw and potential life gain. This card did see some Standard play as a two-of in some Devotion to Green lists, and a copy showed up in a top-performing Naya Midrange deck, as well. It’s definitely a strong card for Green decks to consider in Commander, too.
This is a great draw spell for Green decks everywhere. It's not the rarest card out there, especially with a promotional foil version and a reprint in one of the Commander 2016 decks. But it's a good investment, especially considering how much play it sees in Commander.
Buy your copies of Shamanic Revelation and other Magic: the Gathering cards from TCGPlayer or Amazon.