Koala
Yu-Gi-Oh! archetype · 7 cards
Big KoalaIOC-004 · Invasion of Chaos · +3 printings
Des KoalaMFC-077 · Magician's Force · +5 printings
Koalo-KoalaORCS-EN094 · Order of Chaos
Master of OzSOD-EN035 · Soul of the Duelist · +3 printings
Sea KoalaPTDN-EN037 · Phantom Darkness · +3 printings
Tree OtterRGBT-EN095 · Raging Battle · +2 printings
Vampiric KoalaORCS-EN093 · Order of Chaos · +4 printings
Archetypes from YGOPRODeck and YAML Yugi (Yugipedia).