Damping Sphere (Foil) (DOM) from Dominaria, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Foil
• Artist: Adam Paquette
• Card Text:
  If a land is tapped for two or more mana, it produces C instead of any other type and amount.
  Each spell a player casts costs 1 more to cast for each other spell that player has cast this turn.