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Card Details
At the beginning of your upkeep, sacrifice this enchantment unless you tap an untapped creature you control.
Creatures can't attack you unless their controller pays 
for each creature they control that's attacking you.
Illustrated by Rob Alexander
Rulings (3)
Feb 1, 2007
In the Two-Headed Giant format, you still only have to pay once per creature.
Oct 1, 2008
This has the supertype world. When a world permanent enters, 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 at the same time, they're both put into their owners' graveyards.
Feb 1, 2014
Unless some effect explicitly says otherwise, a creature that can't attack you can still attack a planeswalker you control.