Allura, Songstress of War

If attacking or dealing combat damage from a
creature you control would cause a triggered
ability of a permanent you control to trigger,
that ability triggers an additional time.
{1}{g/u}{g/u}, {t}: Target attacking or blocking creature
you control gains your choice of hexproof or
persist until end of turn.
"The purpose of my song is not to win wars,
it's to end them."