Shield of Light

(barriers can't attack, block or deal damage and are
dealt damage in the form of -1/-1 counters. Damage
that would be dealt to you are dealt to barriers instead.
You may only have one barrier on the battlefield at a
time.)
{1}: remove a -1/-1 counter from Shield of light. Activate this ability only any time you could cast
a sorcery.
Solid light, the marvels of magic.