Nidus, The Disease

+1: Until end of turn, if target creature you control is dealt damage, target creature an opponent controls receives half that damage, rounded up.
-3: Creatures target opponent controls get -3/-3 until end of turn. If five or more creatures are effected, they get -6/-6 until end of turn instead.
-5: Create ten 1/1 black insect creature tokens with haste, infect, and "Whenever this creature dies, target opponent gets one poison counter."