Cornered Market

Enchantment, 2W (3)
Players can't play spells or nonbasic lands with the same name as a nontoken permanent.¹
Don't step on the livelihood of other vendors, or they may step on you. -Mercadian saying.
Illus. Edward P. Beard, Jr.

Crystal Keep Rulings Summaries

• This card only looks at cards in play, not ones on the stack. So it is possible to play two instances of a spell onto the stack. [MM FAQ 1999/09/22]
• Does not prevent effects which "put into play" a card. It only stops people from playing (announcing). [MM FAQ 1999/09/22]

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard
Printings (1/6)	Mercadian Masques (Rare)