Scapegoat

Bug: (Existed since Scapegoat was released)

Note currently (as of the beginning of 2012) the spell Scapegoat will redirect spells your opponent casts on his units.

Scapegoat states it can be cast on friendly units, and redirects the next spell your opponent casts on a friendly unit. However, it will in fact redirect the next spell your opponent casts on any unit.

For example, if your opponent casts Righteous Deflection on his unit while you have Scapegoat active, it will get redirected to your Scapegoat unit.