This deck leverages choices of which unique dragon to play based on the avatar you're staring down on the other side of the realm.

Draconian Bonekite - The most common choice for the deck will be the bonekite. I foresee choosing the bonekite in matchups against aggro or Necromancer who creates a lot of incidental creatures that may pile up.

Draco Corvus - You will want to choose Corvus against avatars that usually have larger threats that may be difficult to interact with. The other reason you choose Corvus is to have sneaky mobility around the realm. This choice also gives your avatar essentially tap pay 3 mana for a bury every turn.

Adtonitum - This deck is built around this dragon less than the others. In a suspected matchup that requires a lot of movement for your avatar, this is a good choice. End of turn lightning bolt is not something to snuff at, especially with the one of Poison Dagger.