Shimmer + Quicksilver Fountain = Soft Lock on Land
I also think the knowledge gained from seeing what your opponent is holding is quite valuable
The Great White Way Archived August 22, 2022, at the Wayback MachineTrue Blue Archived August 22, 2022, at the Wayback MachineIn the Black Archived August 22, 2022, at the Wayback MachineSeeing Red, It's Not Easy Being Green Archived August 22, 2022, at the Wayback MachineJust the Artifacts, Ma'am Archived August 22, 2022, at the Wayback MachineMidas Touch Archived August 22, 2022, at the Wayback MachineThe Great White Way Revisited Archived June 7, 2021, at the Wayback MachineTrue Blue Revisited Archived June 6, 2021, at the Wayback MachineIn the Black Revisited Archived May 31, 2021, at the Wayback MachineSeeing Red Revisited Archived May 31, 2021, at the Wayback MachineIt's Not Easy Being Green Revisited Archived May 31, 2021, at the Wayback Machine 1 2 3 4 5 "What do the different Magic: The Gathering mana colours mean?"
If you have cards in mint condition without any scratches, dents, or damage, you can still sell rare cards for thousands of dollars
