Yes this is exactly what I'm thinking of. :)
Open your shards for 2x or build an epic from the fusion. Flip your lucky coin.
A good Christmas present to yourself is the monthly gem pack. They arrive every day and go to your inbox. That makes it easy to save all of them for when you are ready for a fusion.
I did my first fusion when I was L15 in the dungeons. I used a lot of extra energy and put in a lot of time. The forum walked me thru it. Its best if you wait another month. There are always more champ fusions. And maybe another free lego from the game.