It is quite difficult to handle in actual play and during the draft, which is why I have lowered its rating
The reason why is its Double Lariat ability, which, although it relies on RNG, could effectively deal 300 points of damage in a single swing

Arise!" Most of the time when Zane declares an attack with that monster, he announces "Cyber Valley, attack!" When Zane activates the effect of that monster, he announces "Cyber Valley's effect activates!" When Zane Summons "Cyberdark Edge", he announces "Come, Cyberdark Edge!" Most of the time when Zane declares an attack with that monster, he announces "Attack, Cyberdark Edge!" followed by "Counter Burn!" When Zane activates the effect of that monster, he announces "Cyberdark Edge's effect activates!" When Zane Summons "Cyberdark Horn", he announces "Come, Cyberdark Horn!" Most of the time when Zane declares an attack with that monster, he announces "Attack, Cyberdark Horn!" followed by "Dark Spear!" When Zane activates the effect of that monster, he announces "Cyberdark Horn's effect activates!" When Zane Summons "Cyberdark Keel", he announces "Come, Cyberdark Keel!" Most of the time when Zane declares an attack with that monster, he announces "Attack, Cyberdark Keel!" followed by "Dark Whip!" When Zane activates the effect of that monster, he announces "Cyberdark Keel's effect activates!" When Zane Summons "Doomkaiser Dragon", he announces "Doomkaiser Dragon swoops in!" Most of the time when Zane declares an attack with that monster, he announces "I attack with Doomkaiser Dragon!" When Zane activates the effect of that monster, he announces "Doomkaiser Dragon's effect activates!" When Zane Summons "Exploder Dragon", he announces "Exploder Dragon bursts on the scene!" Most of the time when Zane declares an attack with that monster, he announces "Exploder Dragon

Retrieved December 22, 2008
This change was anticipated, and all products were developed with these targets in mind
SE Secret Rare Cloning X TRAP When your opponent Normal or Flip Summons a monster that has a Level: Target that face-up monster