the cheapest pokemon booster box Pokémon TCG: Mega Evolution—Pitch Black Bundle : Toys & Games including Gigantamax Urshifu in both Single Strike and Rapid Strike styles SEALED CASE! 6x Booster Box

1 exclusive playmat with Mega Charizard X ex artwork

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I did toy with the idea of having this lower on the list as in terms of card quality the Library is just an over cost Mirri's Guile

I also imagine that Petrified Hamlet would go great in an Ultima, Origin of Oblivion deck

It's harder to get around the colorless restriction -- you'd need stuff like Chromatic Orrery -- but probably don't even need it to pop off

Dark Spirit of Malice X DARK Level 3 [ Fiend / Effect ] ATK 1600 DEF 0 When your opponent activates a card or effect (Quick Effect): You can send this card from your hand or field to the GY, then target 1 Level 8 Fiend monster in your GY