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In GLC you play a 60-card deck, but you can only use one type of Pokmon (Fire, Water, Grass, etc.), you can only use one copy of each uniquely-named card (for example, you can only use one Pikachu card, not multiple copies of different Pikachu cards), and all rule box Pokmon like V/GX/EX, etc

While Silent Hallcreeper is a copy of another creature, it won't have any of its previous abilities

There are tons of great options, such as the Janine's Secret Art Supporter card or Brute Bonnet from Pardox Rift's ability doing it for free

The equipped monster can also use the Infinity Stone Spell Cards effects, and if it also has all Infinity Stone Spell Card equipped to it, you also win the Duel