However, these cards can easily set you back thousands of dollars if graded
The deck plays the trainer card Marnie, which markets between 70 cents and $1.70, but often sells for over $2
This can destroy certain decks that need their mana for other things such as casting creatures, and can force them to budget their mana a lot more than they usually would while you just continue playing (assuming youre playing a deck that is big on mana, that is, otherwise this will greatly affect you too)
If you find exactly the card you need, or have plenty of life, this can put you at a big advantage
Cards like Adeline, Resplendent Cathar and Rick, Steadfast Leader quickly make your board state threatening
As a result, when paired with the four-of-a-card limit, many players are especially careful with how they treat their Item cards