Pool of Bethesda

Tap an untapped Angel you control: Prevent the
next X damage that would be dealt to any target
this turn, where X is the power of the Angel
tapped this way.
"For from time to time an angel of the Lord
used to come down into the pool; and the water
was stirred up, so the first one to get in after the
stirring of the water was healed of whatever
disease afflicted him."
—John 5:4