It should be noted that, like its OCG / TCG counterpart, several cards of the Structure Deck require you to have an empty Extra Deck to activate their effects, especially the Wyrm Type branch's monsters
Put those cards onto the battlefield and the rest on the bottom of your library in a random order
Insect Evolution (Signature Card: Perfectly Ultimate Great Moth) (Campaign Difficulty: Easy) (Signature Card: Perfectly Ultimate Great Moth) (Campaign Difficulty: Easy) After the player defeat Weevil's Insect Evolution Deck three times, the next difficulty and Deck is unlocked
By focusing on direct damage, attack, and protection, Steel has elements of Red and White from Magic: The Gathering
If you think about it about, it is pretty bizarre/sad that 90% of the work they make is considered worthless outside the game, so give them the support they deserve and appreciate their work