If the creature you control is a legal target but the other target isn't, your creature will still deal damage to itself
This probably results in some blowouts when you reanimate it in combat after your opponents forget this beholder was chilling in your graveyard
Thats because when Trainer Gallery cards debuted in Dream League [SM11b] in 2019, Trainers Pokmon cards (then known as Owners Pokmon) had not been seen in either a main set or subset for more than 13 yearsthe most recent appearance at the time had been in Holon Phantom, a third-generation set
However, the fact that the summons are going to die in a couple of turns anyway makes me think this is more likely to be just a strong sideboard card
For instance, Tidus from FF10 is a Merfolk creature on his Final Fantasy: Through the Ages card, so there were clearly some concessions made when adapting FF characters for Magic reprints
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