| Algebra Fortress | ||
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 Romaji
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Daisūgaku Yōsai | |
| Card type | Trap Card 
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| Property | Normal 
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Lore Remove 3 Test Number Counters from your side of the field. Until the End Phase, "Test Number" monsters you control cannot be destroyed by battle or by a card effect and cannot be targeted by the effect of opponent's Effect Monsters.
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| Sets | TWKD-EN072 - Twilight Kingdom Common | |
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