While duplicates can be beneficial for obtaining shinedust or flair cosmetics, they generally do not enhance your deck's effectiveness
3) Card Ripping Test (destructive avoid on valuable cards) If you tear a real MTG card, youll usually see an inner colored core layer
Combat based casual decks that dont have alternate wincons whether aggro, midrange, reanimator etc are heavily punished by a Goad heavy meta
2002 Legendary Collection Charizard Holo ($8K-$13K) This is the normal holo version which sells for a lot more than the reverse
My strategy thus far has been to draft one of three decks (most of the time) and other decks in the event that they arent open
Brainstorm, Lightning Bolt, Land Tax, and Swords to Plowshares are all amazing cards that require little investment