Firstly, and perhaps most importantly, Scholar of Combustion is a common
This gives her a higher attack power than any Challenger card in The First Chapter except for Simba: Returned King, who boasts a whopping 8 when challenging but comes in at a significantly higher cost of 7 ink
The tags include standard descriptors such as villain or hero, alongside more thematic keywords such as sorcerer
At this mana cost its certainly replacement level given greens broad access to strong effects, but its also just solid enough for the average deck that Id be interested in running it as a filler card
People would already have jammed Exalted Sunborn at the 5-mana cost, but tacking on a cheap warp lets you set up some strong token lines even earlier
Its also interesting that you can throw the Mjlnir, Hammer of Thor away and retrieve it with Thor later