Like Magic: The Gatherings combat or the Pokmon TCGs battles, challenging sees the two cards involved having their strength and health compared, with damage being exchanged based on the difference between the two
Cube Variations Aside from the traditional draft environment of a cube, there are a few fun variations, which I'll cover here
cards that make him laugh
You can expert merfolk galore, but also some more unusual fantasy races like puffer fish people, penguin people, crab men, walrus women, and something that I would swear was an underwater sliver, if it didn't have the wrong number of limbs
The other issue is that triggering these extra-curricular transformations is hard work
Once you have all the rares from a set, additional packs from that set will substitute normal rares with 20 gems (or 40 for a mythic)