When a monster effect is activated: Discard 1 card; negate the activation, and if you do, destroy that monster.
|Pack||Valkyrie's Rage [UR]|
It's recommended to not put more than 1 copy in a deck, since it relies on your opponent's monster activation, also since it requires you to discard a card from your hand and getting draws can be difficult. You can use it early in the duel to get an advantage by destroying the monster or save it until they start summoning monsters like Gravekeeper's Oracle or Levia-Dragon - Daedalus to destroy them and ensuring victory.
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