I saw the dragons stats and went
too! Ultra rare gemstone? Ultra rare might only be useful against diamonds, but gemstone is weak against diamonds... could be like the Rainbow Sentinel, just a gimmick when in truth it's got a handicap on the Battle Arena. It may not be a contender, but I'm sure it will have it's uses. Diamond gemstone could have been a funny weak+strong combination too.
It's a nice looking dragon though, so I am aiming for it. You must have been really lucky to have won both the parts you need to craft it from the wheel! That thing is notoriously known by many as a bottomless pit of gold.