DEND-JP076 - R
River of Rolling Stones
Continuous Trap
When this card is activated: You can change all Rock monsters you control to face-down Defense Position. When your opponent activates a card or effect: You can target 1 face-down Defense Position monster you control; Flip Summon that target, and if you do, negate the activation. You can only use each effect of "River of Rolling Stones" once per turn.

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