In Magic: The Gathering, the plane of Alara was once split into five shards, each composed of just one color of mana and its two allies. When green is left alone with red and white mana, Naya is the result.
While Jund is a vicious jungle of volcanoes and desperate predators and Bant is a series of honorable kingdoms, Naya is a compromise between the two. It is a lush jungle paradise of snowcapped mountains, rich fields of wheat and titanic beasts that roam the land free of all fear and predation. Here, these giants are more like forces of nature than animals, and the people of Naya worship them with devotion and awe.
The Overflowing Jungle
Naya has jungles like Jund, but these are a very different kind. Without the necromancy of black mana and the scheming of blue, nature has triumphed over empires and artifice, making Naya the absolute opposite of the blue-centered shard of Esper. There was once an empire of sorts, but it has since fallen, and no one is rushing to replace it. Instead, the races of Naya live comfortably in the mountains and lush jungles, hunting and worshiping the great beasts with manic glee and pride. These beasts are often quadrupeds, and may live in massive caves or in the thickest part of the jungle. Some are known to hide patiently in the morning fog until prey happens by, and then they charge with the odd sound of torn fog.
Humans certainly live here, and they are much better off than those of Jund or Grixis. Naya's humans are beautiful and healthy, and they cover themselves with gorgeous (and ritually significant) tattoos, as well as comfortable, minimal clothing to show off their immaculate bodies and prowl the jungle with ease. The humans live on the forest floor, and if they're not hunting or hosting festivals, then they are bonding with the great beasts of the plane. To them, the beasts are like gods, worthy of worship, admiration and support in all forms. The humans will heal their wounds, give them companionship and fight off anyone who would dare harm them.
More powerful are the elves, who live in the treetops and live with complex rules based on intangible tribal boundaries (something that the humans cannot comprehend). These elves also worship the gigantic beasts and are even more finely attuned to Naya's bountiful nature than the humans are. Meanwhile, there is also the race of the nacatl, the local version of leonin. They once had an empire in the mountaintops, but have since abandoned it. The cloud-paw nacatl are sages of the mountains, while the wild nacatl live and hunt in the jungles, priding themselves on their predatory aptitude. In fact, they scorn the mountaintop nacatl as being soft and lazy.
Naya suffered greatly when the five shards of Alara came back together. The rainforest burned as the armies of Jund and Grixis invaded, with Jund dragons seeking new prey and Grixis necromancers looking for new species to kill and convert into zombie war machines. However, Naya's thick jungle provided refuge for anyone and everyone seeking shelter from the war, and surprisingly enough, a number of vedalken from Esper fled to Naya's jungles to escape the sphinxes' oppressive dogma and seek enlightenment in nature. They often consulted the scale patterns of the winged snakes that live on Naya, fascinated by what they saw.
Naya In The Game
Naya decks are not based on a single named mechanic, but they do have a mechanical identity all the same. In the Shards of Alara block, Naya cards are centered around creatures with power five or greater, and flavor-wise, those creatures are the gargantuans that the elves and humans of Naya worship. In this way, Naya decks are vaguely similar to Eldrazi decks from Rise of the Eldrazi, with giant creatures being supported by ramp spells and utility creatures. Naya decks can use mana ramp via green mana to get a few turns ahead, then cast massive threats with first strike, vigilance, trample and related abilities. Godsire, for example, is Naya's non-legendary mythic rare creature. It's a colossal 8/8 Beast costing 4RGGW, and not only does it have vigilance but it can tap to create an 8/8 Beast creature to
Support cards tend to be Elves and Humans in green, red and/or white mana, and they can either tap for mana or use abilities that support the gargantuans. They can prevent all damage dealt to a creature with power five or greater, regenerate it or give it trample or first strike. Still, some of these creatures can fight on their own, and they are powerful for their mana cost while having some flexibility due to their white and red mana. Naya's spells are flexible too, with Naya Charm being able to use a Lightning Bolt effect, return a creature card from the graveyard to the hand or tap every creature a targeted player controls. That latter effect can easily pave the way for a few gargantuans to attack and win the game.