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C Common Tindangle Delaunay X TRAP When you take battle damage from an opponent's attacking monster, while you have 3 or more "Tindangle" monsters with different names in your GY: You can destroy the attacking monster, and if you do, Special Summon 1 "Tindangle Acute Cerberus" from your Extra Deck

This card's not particularly useful, but the main reason it's expensive is the nostalgic factor that comes from nearly every Pegasus card

During your Main Phase: You can banish this card from your GY, then target 1 Effect Monster your opponent controls

Aurelia, the Warleader had a recent reprint in Double Masters 2022 that significantly reduced this cards price

That's why the first effect can potentially boost this card's ATK by 1000, the same amount that Fiendish Engine gains with its own effect