Each pack contains a fixed number of cards pulled from a specific set, with guaranteed slots for certain rarities
That card perpetually becomes an artifact creature
Oh, and he has a tail, but really, it's the fashion choices we notice over anything else
This ability has the potential to close out a game before your opponent even gets to draw a card under the right circumstances, so in order to avoid this scenario, they preemptively banned the card before it became too reliable.
For those few times this comes out on the cheap saccing off something that has served its purpose like a Wood Elves and then going on to hit two things in their hand then it is pretty game ending
First, one Gateway player will command a deck made up of Amber and Amethyst cards while the other will play with Ruby and Sapphire