Blades of Putrefaction

Blades of Putrefaction has a casting value of 7.
If successfully cast, pick a friendly unit within
14" of the caster that is visible to them. Until
your next hero phase, hit rolls of 6+ for that
unit inflict 1 mortal wound in addition to any
other damage.
The wizard blesses weapons so that they ooze with
the choicest of Nurgle's foul contagions.