Koskun Falls (FR Koskun Falls)

Enchant World    (CMC:4)

During your upkeep, tap target untapped creature you control or bury Koskun Falls.\nNo creature can attack you unless its controller pays an additional whenever that creature attacks.

HM • FRRob Alexander

™ & © 1993—1995 Wizards of the Coast

Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

Koskun Falls {2}{B}{B} World Enchantment 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.

2/1/2007
In the Two-Headed Giant format, you still only have to pay once per creature.
10/1/2008
This has the supertype world. When a world permanent enters the battlefield, any world permanents that were already on the battlefield are put into their owners' graveyards. This is a state-based action called the "world rule." The new world permanent stays on the battlefield. If two world permanents enter the battlefield at the same time, they're both put into their owners' graveyards.
2/1/2014
Unless some effect explicitly says otherwise, a creature that can't attack you can still attack a planeswalker you control.

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