![Professor Oak's New Theory (101/123) (League Promo) [HeartGold & SoulSilver: Base Set] Scheme Great hero or grand betrayer](https://cdn.shopify.com/s/files/1/0537/7792/4293/products/54c72f8f-a064-46bd-b9e2-817ec7174f98_5e3a0387-a16c-4b6e-8e11-125802d8d229.jpg?v=1707440450)
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Great hero or grand betrayer
Set: Darksteel Type: Artifact Rarity: Rare Cost: {3} As long as Trinisphere is untapped
Set: Summer Magic / Edgar Type: Artifact Rarity: Rare Cost: {2} {3}
destroy this card unless you send 1 "Iron Core of Koa'ki Meiru" from your hand to the Graveyard or reveal 1 Dragon-Type monster in your hand
Professor Oak's New Theory (101/123) (League Promo) [HeartGold & SoulSilver: Base Set] Scheme Great hero or grand betrayerSet: HeartGold & SoulSilver: Base Set Type: Supporter Rarity: Promo
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