Koskun Falls

World Enchantment, 2BB (4)
At the beginning of your upkeep, sacrifice Koskun Falls unless you tap an untapped creature you control.
Creatures can't attack you unless their controller pays {2} for each creature he or she controls that's attacking you.¹
Illus. Rob Alexander

Crystal Keep Rulings Summaries

• The cost is paid as attackers are declared. [D'Angelo 2007/02/04]
• Note - Also see Enchant World, Rule G23.5.
• Note - This card was of type "Enchant World" until Oracle 2005/08/01.

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