When your opponent activates a card or effect that targets this face-down monster (Quick Effect): You can change this card to face-up Defense Position; negate the activation, and if you do, destroy that card. After this card was flipped face-up, while it is in the Monster Zone, negate all monster effects activated on your opponent's field. If this card on the field is destroyed by battle or card effect: You can add, from your Deck to your hand, 1 Level 9 monster with a different original Type and Attribute than this card. You can only use this effect of "Deus X-Krawler" once per turn.
FLIP: You can Special Summon 1 monster from your hand. When your opponent activates a Normal Spell/Trap Card (Quick Effect): You can Tribute 1 other monster; the activated effect becomes "Change 1 face-up monster your opponent controls to face-down Defense Position". You can only use this effect of "Fairy Tail - Sleeper" once per turn.