Sphere of Safety
Enchantment
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.
The Rakdos believe that all are eager to join their revels, even when told otherwise.
Slawomir Maniak
Rulings
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.
(wotc • 2012-10-01)
Rulings
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.
(wotc • 2012-10-01)