Gem-Knight Master Diamond [HA07-EN059] Secret Rare Duel Master's Guide it can attack all monsters

it can attack all monsters your opponent controls with a Predator Counter

Set: Premium Gold Card type: Tuner Monster Rarity: Gold Rare Attack: 0 Defense: 0 During your opponent's Main Phase: You can send this card from your hand to the Graveyard

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Gem-Knight Master Diamond [HA07-EN059] Secret Rare Duel Master's Guide it can attack all monstersSet: Hidden Arsenal 7: Knight of Stars Card type: Fusion Effect Monster Rarity: Secret Rare Attack: 2900 Defense: 2500 3 "Gem Knight" monsters Must first be Fusion Summoned. This card gains 100 ATK for each "Gem " monster in your Graveyard. Once per turn: You can banish 1 Level 7 or lower "Gem Knight" Fusion Monster from your Graveyard; until the End Phase, this card's name and original effect become the same as that banished monster's.