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Or you can put them both in the deck Ancient Den for Plains: This is up in the air Ancient Den dies to a lot of removal and can set you back a mana, but also it triggers metalcraft so it's up in the air

Its cheap and a pretty hard card type to deal with right now, so this can slot into many decks

I'm also wary on how to evaluate Solemn Simulacrum

SE Secret Rare Silver Gadget X LIGHT Level 4 [ MachineEffect ] ATK 1500 DEF 1000 When this card is Normal or Special Summoned: You can Special Summon 1 Level 4 Machine monster from your hand

Cons: This decks monsters dont have a lot of protection

This makes a total of 30 base set booster packs variations