"A Case for K9" 
20
Continuous SpellWhen this card is activated: You can add 1 "K9" monster from your Deck to your hand. "K9" monsters you control gain 900 ATK during any turn in which your opponent has activated a monster effect in the hand or GY. If this card in the Spell & Trap Zone is destroyed by card effect: You can Set 1 "K9" Quick-Play Spell from your Deck or GY. You can only use this effect of ""A Case for K9"" once per turn. You can only activate 1 ""A Case for K9"" per turn.
K9-EW Special Release Experiment
Normal TrapSpecial Summon 1 "K9" monster from your hand or GY, then you can Special Summon 1 "K9" Xyz Monster from your Extra Deck, by using that monster as material (this is treated as an Xyz Summon), but destroy the monster Special Summoned from the Extra Deck, during the End Phase of the next turn. During the End Phase: You can banish this card from your GY, then target 1 "K9" Quick-Play Spell in your GY; Set it. You can only use each effect of "K9-EW Special Release Experiment" once per turn.
K9-LC Release Restraint
Quick-Play SpellTarget 1 "K9" Xyz Monster or 1 Rank 5 Xyz Monster you control; Special Summon from your Extra Deck, 1 "K9" Xyz Monster with a different name, by using that monster you control (this is treated as an Xyz Summon, transfer its materials to the Summoned monster). At the end of the Battle Phase, if your "K9" monster battled this turn: You can Set this card from your GY. You can only use each effect of "K9-LC Release Restraint" once per turn.
K9-X Forced Release
Quick-Play SpellDuring the Main Phase: Target 1 "K9" Xyz Monster you control; Special Summon from your Extra Deck, 1 "K9" Xyz Monster with a different name, by using that monster you control (this is treated as an Xyz Summon, transfer its materials to the Summoned monster), then you can destroy 1 card your opponent controls. At the end of the Battle Phase, if your "K9" monster battled this turn: You can Set this card from your GY. You can only use each effect of "K9-X Forced Release" once per turn.