, Sacrifice three other creatures: Exile Elesh Norn, then return it to the battlefield transformed under its owner's control
Kaalia of the Vast can cheat it from your hand (since it's a dragon), Yuna, Hope of Spira can bring it back from your graveyard (since it's an enchantment), and Esper Terra can copy it and trigger most of Bahamut's value by advancing three chapters: Summon: Bahamut isnt legendary, so Esper Terra has no problem copying it
Aurora Shifter copies exactly what was printed on the original creature and nothing else, with the listed exception (unless that permanent is copying something else
So, if your opponent has energy counters and rad counters, you can give them one of each or nothing at all, but you can't give them only a rad counter
Finally it is a cheap effective removal spell that ranks up there with Path and Plow when you are facing the most serious of threats
Being limited and one shot and sorcery makes it not a great sac outlet but then really this is just an on-theme card draw tool