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Archfiend of Ifnir Archfiend of Ifnir is an already strong demon creature as a 5/4 flier

Disregarding all of that, Im also not convinced that playing this card would lead to particularly fun board states

Collectors value it not just for rarity but for balance

(2019-10-04) If an adventurer card ends up in exile for any other reason than by exiling itself while resolving, it won't give you permission to cast it as a permanent spell

Whenever you cast a spell that has convoke, this creature deals 1 damage to each opponent and each battle they protect

And of course this goes in your Emiel the Blessed ETB unicorn deck too