pokemon gold card charizard v Amazon.com: Japanese : Toys & Games Colorless Fire Spin (220) Discard 2 Energy from this Pokémon Gold Charizard V Vmax GX

Especially rare Pokmon cards can sell for incredible amounts of cash, especially when they feature the cutest Pokmon around

EDIT: A new and more likely theory has presented itself for Grey stamps in this post by @pokemonrevolution

You can go infinite with Sensei's Divining Top a dozen different ways, plus cost reduction can help you play cards like Portal to Phyrexia and Cityscape Leveler well ahead of schedule

Most valuable cards in The Brothers' War 1 Portal to Phyrexia$58.28 2 Myrel, Shield of Argive$40.49 3 Awaken the Woods$29.03 4 Portal to Phyrexia$28.56 5 Cityscape Leveler$25.61 6 Awaken the Woods$19.43 7 Myrel, Shield of Argive$18.86 8 Gix, Yawgmoth Praetor$15.90 9 Cityscape Leveler$15.15 10 Diabolic Intent$14.89 Card prices for The Brothers' War