We scoured the tomes of Magic to find them, so let's get right to some really cool creatures
Where the deck lacks oomph is with the potatoes
While it might seem like a one-to-one trade, a land for an artifact, there are a few key points to keep in mind

Our guess is the current story will play out as follows : Ursula is using Ariels voice to control glimmers to find powerful lore items Flotsam and Jetsam are scouting out to find and steal lore or keep an eye on where the Illumineers are, and get it before them She grows her lair, maybe creating an Illuminary of her own to try to control the realm The Lair is found above ground because of the storms, which draws in glimmers Some glimmers like Eric go missing, and Ursula uses her growing powers to Entangle them and steal even more lore Illumineers notice glimmers and lore are missing so investigate Bruno sees the showdown with Ursula and smashes the tablet, hoping it wont come true The team find the lair and there is a showdown, Ursula loses and retreats under the sea The team then track her down, finding Ursula and her lair have grown hugely powerful A face-off ensues against Ursula and her Entangled glimmers If the team win, the glimmers are freed and the team win something we could guess at but will instead leave to you to find out and keep secret As for the origin story Yen Sid Sorcerer or Curator

These are the first cards that leapt to my mind when I saw Charix on the spoiler list
The ability to dodge spells like Lightning Bolt, Swords to Plowshares, and Mind Control is incredibly valuable