Activate when an ally or enemy monster with 2000 or less ATK appears!! All copies of that card in the Deck are destroyed.

Viz Media lore?: (The English manga by Viz Media sometimes uses lores which are inconsistent with the Japanese lore or how the card worked.): You can activate this card when a monster with an ATK of 2000 points or less is summoned (including Special Summon). This monster is destroyed, together with all Monster Cards of the same name in the summoning player's hand and Deck. The summoning player's Deck is then shuffled.