Mu: One Ore. Drops a Potion.
Ghost: One Ore. Drops a Hi Potion.
Ladybug: Two Ore. Drops an Ether.
Yeti: Two Ore. Drops an Elixir.
Nymph: Three Ore. Drops 2 Emeralds.
Jabberwock: One Emerald. Drops a Moonstone.
Feather Circle: One Moonstone. Drops a Lapis Lazuli.
Garuda: One Lapis Lazuli. Drops a Diamond.
Yan: One Diamond. Drops a Rosetta Ring.

One Ore isn't enough.

(SPOILER)Four. Yellow, light blue, red, dark blue.