This Effect lets you get different Infernoid names into your graveyard, which is pretty much the equivalent of activating multiple Foolish Burials in one go
There's been some discussion online about Dragon Magia Master only being printed as a Quarter Century Secret Rare, making it one of the hardest cards to pull in the set, which has disappointed some casual players hoping to pick this up for their decks
5 Ornithological Studies Ornithology means the study of birds
I think the differences are quite obvious
Use 2 Infernity Beetle and Infernity Archfiend to Synchro Summon Muddy Mudragon, to Fusion Summon Archfiends Manifestation
If a popular species, like the Pikachu above, gets a Full Art, it will often become more valuable than even the Secret Rares of a set