Demon Beaver is a monster belonging to the same 'Demon' theme as Demon's Mirror!
I thought 'Daemon Summon', which appeared in a cartoon and showed a full of force, was the first, but it was surprising that these were the first lol
The English version of the name is "Archfiend Marmot of Nefariousness", but cruel? heinous? With the title
It's really got some high-level demonic name LolLolhaha
The monster on this card will later appear as a short-lived familiar next to the card called Commander Aus!
Seems like fan service for players who have been playing for a long time haha