Take Wurmwall Sweeper, for instance
Like most Pokmon cards, the value of Gyarados-EX depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (XY Black Star Promos)
Make sure the shipper scans your item at the drop-off location
While Mill X cards like Wall of Lost Thoughts will churn through four cards for two mana, which isnt a terrible mana to mill ratio, without top deck knowledge theres no way of knowing what exactly youre putting in your graveyard
Even though some players are afraid of damaging their collection by Windex, it wont do anything bad to your set if you use it in the right way
Occasionally you'll want ten and seven