Yu-Gi-Oh! Nightmare Troubadour: Beginner Puzzle 10

Beginner #10 The Koala Brothers --- Activate Creature Swap and select your Master of Oz.

Summon Copy Cat and select Master of Oz.

Activate Spell Reproduction by discarding Tribute to the Doomed and Shield & Sword and select Opti-Camouflage Armor.

Activate Opti-Camouflage Armor and select Copy Cat.

Switch to Battle Phase.

Attack opponent's life points with Copy Cat.