digimon cards 1999 first edition MetalEtmon Holo Card- All you need to get started 1999 Bandai full set St-01

They're doing this to make profit

1 Tuner + 1 or more non-Tuner monsters Once per turn: You can reveal 3 Equip Spell Cards from your Deck, then your opponent randomly adds 1 of them to your hand, and you shuffle the rest back into your Deck

It is not about the ability of this card itself, but it is being talked about because an infinite turn combo can be established using the "Aeon counters" used to count the milling gimmick

Those cards easily allow you to be piloting the best deck under pretty much any circumstance

The monsters themselves have this Roman centurion look to them and look appropriately ancient with their steampunk-ish designs and rusting appearances which gives us many cool and creative looking monsters to collect and put in our decks like Ancient Gear Golem, Ancient Gear Wyvern, Ancient Gear Reactor Dragon and much more