This cubelet is inspired by the world of Avatar The Last Airbender. While bending as in the show doesn't exist in the world of magic the gathering, there does exist some cards with artwork/names that meshes nicely. This only plays a small role in the cubelet though, with the bigger role being jing. (https://avatar.fandom.com/wiki/Jing)
Jing essentially describes the 4 combat styles of the different bending techniques, and I chose cards that represent those combat styles to then represent their associated bending. There are descriptions for each of these below. There is also a fifth tribe in this cubelet, and that represents the spirits from ATLA. Using mainly Kamigawa block spirits, and just choosing ones I thought would be interesting in colors that needed more representation in the cubelet.

Water

Primary:
Secondary:
Waterbenders will alternate between and maintain a balance of both positive and negative jing in combat, allowing them to turn defense into offense as they use their opponent's force against them while conserving their own.
Counterspell, Tap, Power Reduction, P/T Swap, Prowess, Control, Bounce

Earth

Primary:
Secondary:
When in combat, earthbenders are more stationary combatants, usually waiting for their opponent to come to them, while standing their ground and meeting their opponents' attacks head-on, before delivering a deadly strike of their own.
Combat tricks, activated abilities, +1/+1 counters, Vigilance

Fire

Primary:
Secondary:
Firebenders typically prefer action to inaction or conflict avoidance, relying heavily on preemptive strikes to overwhelm their opponents with sheer power
Burn, Haste, Prowess

Air

Primary:
Secondary:
Airbenders assert that fighting is only to be used as a last resort when conflict cannot be avoided. They are more mobile fighters compared to earthbenders and possess a highly dynamic fighting style; to "avoid and evade" is recognized as a typical airbender tactic.
Blink, Flying, Pacifism, Exile, Protection, Prowess

Spirits

Primary:
Secondary:
No jing reasoning here, but the spirits of ATLA are important. They allowed me to add more black into the cube, as well as some board wipes.

Avatar

Cards I feel represent the avatar in one way or another.

Non-Benders

Small section, might be expanded later. No real theme other then specific characters from the show.

• Supports 2 – 4 players, each with a starting life of 20, or 10 if you are playing a quick game
• A single deck containing 100 cards, singleton
• No lands
• Shared library, graveyard, and exile
• If playing multiplayer, multiplayer rules are in effect (1st player will draw on their first turn)
• Each player starts with the maximum seven cards in their hand
• During your turn, you may play up to one card from your hand face down. It becomes a land of all land types and has shroud
• Other than that, you play the game as normal​