Sphere of Safety
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Creatures can't attack you or planeswalkers you control unless their controller pays 
for each of those creatures, where X is the number of enchantments you control.
Illustrated by Slawomir Maniak
Rulings (1)
Oct 1, 2012
If you control Sphere of Safety, your opponents can choose not to attack with a creature with an ability that says it attacks if able.
