Evolving Spears Minecraft Mod

I'm seeking a talented Minecraft mod developer to create a unique mod that allows players' spears to evolve into better materials as they eliminate opponents. (ex: kill 3 players with iron = copper kill 6 more players to get diamond)

Key Requirements:
- Spear evolution based on player kills (e.g., stone -> iron -> copper -> diamond -> netherite)
- Integration with existing game mechanics
- Balance to ensure fair gameplay

Ideal Skills:
- Experience with Minecraft modding
- Proficiency in Java
- Strong understanding of Minecraft mechanics and balance

Please provide examples of previous work and a brief outline of your approach.