Atraxa shines in a planeswalker-based deck, adding additional counters to each planeswalker to accelerate them toward their ultimate abilities.
Targeted effects like Thoughtseize and Inquisition of Kozilek suddenly can't pick apart your hand on turn one, burn spells aimed at your face have to find a new destination, and certain combo decks that need to target a player in order to win now have to awkwardly find another win condition
Similar to Lantern, Pluto's ability, Good Dog, acts as ramp for this deck, allowing you to cheat out cards a turn early, or play extra cards during your turn that you otherwise wouldn't have had enough ink to play
Terror of the Peaks is one of my favorite creatures, but it would be pretty oppressive in the command zone
Maskwood Nexus is a consideration if were playing some non-Dragon creatures that otherwise play nicely with Dragons like Dragonspeaker Shaman or Dragonlords Servant