I have 2 more Google Play achievements left in this game, but it looks like I will never get them if spells have really gone away forever. I need to cast 3 spells in a row, but all of my spells are gone and I can't buy more.
I also need to clear a 5-room level using 1 bird per level. If that hasn't happened after many, many hours of play then maybe it was just never going to happen.
Somehow I convinced myself that if I got every single one of these achievements, I would be recognized by Rovio and invited to the premiere of the movie. [Yes, I'm aware this wasn't actually going to happen, but let me dream).