yu gi oh duel links alien deck Yugioh Stardust Dragon 40 Cards + Extra Deck + Sleeves – Budget Yugioh Decks Alien Deck (Yu-Gi-Oh)

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Its literally giving your opponent a free Forceful Sentry (which is a spell card thats so good its been banned for years)

UR Ultra Rare Gaia The Fierce Knight X EARTH Level 7 [ WarriorNormal ] ATK 2300 DEF 2100 A knight whose horse travels faster than the wind

C Common Silent Swordsman LV5 X LIGHT Level 5 [ WarriorEffect ] ATK 2300 DEF 1000 Unaffected by your opponent's Spell effects

If things had stopped there, perhaps it would have been fine, but, eventually, they introduced tuners that could come back from the graveyard, creating near-infinite fodder to create larger fields