Four-Leaf Dragons first sprang into being at the end of a rainbow, surrounded by pots of gold. They are immune to every disease and their only known predators went extinct centuries ago. Without doubt they are the luckiest dragons known to man.
If you're ever going to the dragon race track, take your Four-Leaf Dragon out to the paddocks first to meet the other dragons. The Four-Leaf Dragon will always sniff one dragon intentionally, who always ends up being the winner of the race.