Well, that assumption was overturned, like so many assumptions I have made on this blog, with the release of Dominaria. We were already amazed by references to Carthalions, Epityr's history with Sheoltun and what not, when Ethan Fleisher tweeted the origin of this card's name:
You see, "Time of Ice" isn't just a fancy term "Ice Age". It is actually a reference to an in-universe book, one you can read if you talk a certain NPC in the game Battlemage! Suddenly there is a bunch more stuff in that game that is relevant to continuity!
I was already dreading the idea of having to try and get the game to work and do multiple playthroughs just for those lore bits, but luckily April King is a lot smarter than me and just broke into the game's code to fish out these documents. So let's have another blast to the past and dive into some in-universe books!