Darksteel Hydra is a Artifact creature phyrexian hydra card in Magic: the Gathering MTG
We've got a soft spot for this card: it's saved us from Teferi again and again
The original Rules Committee was very clear that if they could have found a way to restrict you from playing fetches that named basic land types that weren't in your color identity, they would have done it
After the easy-includes called out in the article so far, you are left with a ton of efficient burn (Lightning Bolt, Chain Lightning), a ton of great beaters (Plated Geopede, Ash Zealot), and a few higher-end powerhouses (Chandras Phoenix, Staggershock)
Some clones might add a creature type, like Mirrorhall Mimic becoming a spirit in addition to its other types, but clones copy everything on the printed card
Its a card whose value has been creeping up over time and would have continued to do so without a reprint, so its quite a good one to see in a set of this size