i hate RT and i always will. i believe it should be 3|2 since it essentially doubles the cost of any card, blocks drawing for a turn and removes any buffs from said target which makes it arguably better than lightning, which is balanced. lightning has a limit to what it can kill, RT does not (excluding immortals). as stated previously, it blocks the next draw, and is unaffected by sanc. which makes it better than nightmare in some cases.
and eternity is even worse