According to multiple sources, the rarest axolotl in Minecraft is the blue axolotl. It has a spawn chance of just 1 in 1200 (0.083%), making it one of the rarest mobs in the game. The blue axolotl can only be obtained by breeding two axolotls, and there is a 0.083% chance of spawning a blue axolotl when two axolotls are bred. The other colors of axolotls include leucistic (pink), brown, gold, and cyan.