When you deploy Katuunko, take 1 40/2/2 Toydarian Royal Guard Subordinate with "King Katuunko can't be attacked" and put it into your Character arena.
When your build step starts, choose one: Gain 2 build points. Or: Draw 2 cards
When the battle phase ends, if your units have not discarded any of your opponent's units in the Ground or Character arena, your opponent gains control of King Katuunko