Tsabo's Decree (Antoine Ruel) [World Championship Decks 2001] Legendary Snow Land You can only use this

You can only use this effect of "Darkness Metal

how would I know it worked

Set: Dark Legends Card type: Effect Monster Rarity: Rare Attack: 1000 Defense: 2000 You can Tribute 1 monster to Inflict damage equal to half of its ATK to your opponent

"Life is a game

Set: 5D's Over the Nexus Promo Cards Card type: Effect Monster Rarity: Ultra Rare Attack: 0 Defense: 0 If this card is destroyed by a card effect and sent to the Graveyard

Tsabo's Decree (Antoine Ruel) [World Championship Decks 2001] Legendary Snow Land You can only use thisSet: World Championship Decks 2001 Type: Instant Rarity: Rare Cost: {5}{B} Choose a creature type. Target player reveals their hand and discards all creature cards of that type. Then destroy all creatures of that type that player controls. They can't be regenerated.