Card Rules: Rulings powered by The Netrep API. If you remove Monster Cards from your Graveyard to increase the ATK of 'Bazoo the Soul-Eater' , then on your opponent's turn he uses 'Change of Heart' to gain control of the same 'Bazoo the Soul-Eater' your opponent can remove cards from his Graveyard to further increase the ATK. The ATK increase you caused will end during that End Phase and the ATK increase your opponent caused will end during your End Phase. Removing Monster Cards from the Graveyard is a cost of 'Bazoo the Soul-Eater''s effect so if your opponent chains to the activation of this effect with 'Call of the Haunted' to Special Summon 'Kycoo the Ghost Destroyer' the effect of 'Bazoo the Soul-Eater' is not negated since the Monster Cards were already removed. [Re: Necrovalley] 'Necrovalley' negates costs and effects that require removing cards from the Graveyard. So 'Necrovalley' WILL prevent a player from removing cards in the Graveyard from play to activate the effect of 'Bazoo the Soul-Eater' or 'Chaosrider Gustaph'. 'Necrovalley' WILL prevent a player from removing cards in the Graveyard from play to Special Summon 'Dark Necrofear' or 'Black Luster Soldier - Envoy of the Beginning'. 'Necrovalley' WILL negate card effects like 'Big Burn' 'Gravedigger Ghoul' 'Disappear' and 'Soul Release'. [Re: Skill Drain] If your opponent uses 'Bazoo the Soul-Eater''s effect to increase its ATK and you use 'Skill Drain' 'Bazoo the Soul-Eater''s ATK returns to normal even if 'Skill Drain' is destroyed after resolving. If 'Skill Drain' is negating 'Bazoo the Soul-Eater''s effect you can still pay the cost and remove monsters in your Graveyard from play but 'Bazoo the Soul-Eater''s ATK will not increase. Passcode: 40133511 Set: Tournament Pack 5 ATK/DEF: 1600/900 Card Number: TP5-EN007 Monster Type: Beast Rarity: Rare Attribute: Earth Card Text: You can remove from play up to 3 Monster Cards in your Graveyard to increase the ATK of this monster by 300 points for each card removed from play until the end of your opponent's next turn. This effect can only be used once during your turn. Level: 4 Card Type: Effect Monster Name: Bazoo the Soul-Eater Edition: Unlimited