Justicar Syndra is possibly what Syndra would look like if she was not evil or corrupt. This is because of the yellow spheres, warm color scheme and the use of white feathers. Her spheres and helmet also resemble the sun which is also a symbol for divinity.
The word "Justicar" also means "man of justice" i.e a judge.
The primary play on words is regarding her lore where she was deemed mentally unbalanced by her Ionian elders (as balance is a defining virtue in Ionian culture), and stands upon on her dark spheres to prove that she "has balance."
It also refers to Syndra's champion balance as she was reportedly overpowered during development.