Erol, Voice of Judgement

{p/u}{p/b}: whenever an opponent casts an instant, choose a new target for that instant
{p/b}{p/r}: whenever an opponent casts a sorcery, choose a new target for that sorcery
{p/r}{p/u}: whenever an opponent casts an an enchantment that targets a player or creature, choose a new target for that instant
" Decisions, Decisions..."