RD/KP06-JP064 永久凍結 Eikyuu Touketsu (Eternal Freeze)
Normal Trap Card
[Requirement] When your opponent Normal Summons a monster (ATK 2500 or higher), you can activate this by sending 1 monster you control to the Graveyard.
[Effect] Place that Normal Summoned monster on the bottom of its owner’s Deck.

Source