Im with Lord on this topic. An errata isn't necessary for this card. Whenever we play, we just play with the house rule that you can't teleport the enemy mage. Sure, it basically removes any sort of Zone of Death strategy, but there are other strategy's beside that. We both still have fun and teleport is still very useful. Even though teleport can't target the enemy mage, force push spells are still something that you need to be wary of.
I think, however, there should at least be a spell (equipment, conjuration, enchantment) that could counter it in some way i.e. the amulet Lord mentioned.
I also like Schwenkgotts idea about double mana possibly.