Sphere of Safety

Creatures can't attack you or a planeswalker you control unless their controller pays {x} for each of
those creatures, where X is the number of enchantments you control.
—
Shining Armor's shield held, and the beast hefted us
both into the air, rattling us violently around inside the
orb as it tried to pierce the improvised magical
structure, worrying it with shakes of the enormous
lupine head.