Thanks for the contest!
Here's the answers:
1 - DYGYCON is a virtual event brought by the Splinterlands team via the GamerJibe (platform?) starting on 11/28, tomorrow! (I didn't know about it, thanks! I'll check it out!)
2 - Korjack is the formal name for the Black Dragon legendary card.
3 - Plado Emberstorm has graduated from every school in the Burning Lands, probably why he's such a strong legendary summoner!