Skip the Draw Phase of your next turn
These effects can only be used once per turn, but in a proper deck, it can destroy most if not all the opponent's monsters while keeping the player's monsters safe
The control of the attacking monster and the attack target monster is exchanged until the end phase, and damage is calculated
If your opponent Normal or Special Summons a monster(s) (except during the Damage Step), or if an opponent's monster targets this card for an attack: You can return this card to the Extra Deck, then, you can Special Summon 1 "Melffy" Xyz Monster from your Extra Deck
C Common Kozmo DOG Fighter X DARK Level 6 [ MachineEffect ] ATK 2000 DEF 2400 Once per turn, during the Standby Phase: You can Special Summon 1 "DOG Fighter Token" (Machine-Type/DARK/Level 6/ATK 2000/DEF 2400)
From here, the potential is limitless