Was thinking about it, and this actually has come up more than once, not sure if we are doing it right.  What happens if he tries to teleport me, but I have reverse magic on?  I understand the steps to go through, but this one seems harder for me to get my head around, could argue it more than one way. Does he pay for where he wanted to teleport me?  or does he pay for where I decide to teleport him?  Along the same lines, with Nullify, should he clarify where he was trying to teleport me so he knows how much mana to spend even though the teleport is nullified?  We keep forgetting and I reveal teleport before he declares the zone he wants to teleport to.  In a tourney or something, he could just say he was only going to move you one space to avoid paying the extra mana.