battle immunity and negation or destruction prevention. They have a strong turn 2 and decent removal but falter quickly when the opponent can tank thier attacks.
Have Sphere Kuriboh in your hand. Really.
Don't summon anything. Set your trap(s). On their turn, CyDra players will cockily summon their Rampage, thinking they'll otk. Pretend to struggle a little. When they finally attack, Sphere them. Fearing get counterattacked, they will instantly surrender.