Interesting indeed. I always thought casting on the creature had the 0-2 restriction. I don't believe i've ever had a game that was 15+ mana but i thought it would work if the situation arose.
Thanks for the insight!
On the 3X4 arena mat the only zones that are 5 zones away from each other are opposite corners. Every other zone is 4 or less zones from all the others.
Hedge