The two wheels
Each constellation beats the next one in its cycle, and the last beats the first. The Celestial cycle has four constellations and the Earthly has six.
The bonus
When the attacking monster and the defending monster have constellations of the same cycle and one beats the other, the one with the advantage gets +500 on the value used only in this battle (the attacker's ATK, or the defender's ATK/DEF). Constellations of different cycles do not interact. On a direct attack the bonus does not exist.
Lake Texcoco SerpentSerpent · WaterATK 1,200Moon
Mountain Lightning FalconBird · ThunderATK 1,250WispLake Texcoco Serpent (1,200) summoned with the Moon constellation attacks Mountain Lightning Falcon (1,250) summoned with Wisp. Moon beats Wisp: 1,200 + 500 = 1,700 against 1,250. The attack, which would lose, wins.
Choosing well
Every monster has two constellations, one from each cycle. When you summon a single card you choose which one is active. Look at the opponent's face-up monsters: choose the constellation that beats theirs.
