Pair Perdita, Devoted Mother with some 2 cost characters that have abilities trigger when they enter play like Pinocchio, Talkative Puppet and youve got yourself an effective little recursion engine
Hades devious nature and sinister plotting are perfectly captured in his Sinister Plot ability
If you know of any dragons Ive missed after painstakingly browsing through every card in Gatherer with dragon in its name or text and checking its price, do share with me in the comments below, or catch me on Twitter @theguoheng
4 Arms Of Hadar Cards like Fiery Cannonade are already staples in the Pauper format, and Arms Of Hadar is a stronger version than that
The early game matters a lot in Lorcana as whoever gets momentum first will often end up winning
You could add a third reason, which is to test a synergy you want to play, but can't afford to invest hundreds of dollars into without testing it