Flinging it at your opponent essentially deals double damage, making Heartfire Hero incredibly explosive
Worst-case, you have a grizzly bear, and best case you have a two mana 2/2 that draws you a card -- which is just a great deal
And it was later used in the 2001 Pokmon World Collection set
Considering how 'demons' are phased out of M:TG cards at this point because of all the religious scares, it's a neat little meta-commentary

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