waluigi
Terrarian
I Have a razorpine but they are hard to get however I find Pumpkin and Frost Moons have an increase drop chance when they are in there appropriate seasons (Halloween - Pumpkin Moon and Christmas - Frost Moon)and yet we find one in the first few days of hardmode.
Mine would probably be the razorpine. Not only are frost moons hard to get, the pine tree things are hard as heck to kill.
Also, my recent run with @Fuzzy Ultimate Chimera completely eliminates the most frequent ideas on here.