1st edition metal raiders booster box *EXTREMELY RARE YUGIOH OPENING* Portuguese MRD Booster Packs! Barrel Dragon Yu-Gi-Oh 25th Anniversary: Metal Raiders

It cant be the target of Tenacious Tomeseekers triggered ability (return target instant or sorcery card from your graveyard to your hand)

This one relies on Special summoning Dragon-type monsters en masse thanks to its key cards (especially Red-Eyes Darkness Metal Dragon), while also setting up the hand and Deck in order to summon enormous Dragon-type Fusion monsters, especially Five-Headed Dragon, which has 5000 ATK and DEF, the highest values that can ever be on a card

There are lots of "Dark Magician"-related cards such as "Soul Servant" and "Eternal Soul"

All three are pretty good, and then you can make Kaldra and equip with it with your three pieces when you control all three, and that was pretty good in Commander with your equipment Tutors, and droppers like Stoneforge Mystic