Don't be deceived by the lack of flashiness, though - this card packs a major Constructed punch
Steel Hellkite A flying artifact creature with good stats, Steel Hellkites real strength comes from its incredibly flexible destruction effect, enabling it to wipe out hordes of token creatures for free
Mirror Entity Speaking of cards that have seen competitive play, the Mirror Entity was a staple of kithkin aggro back at the beginning of the now-extinct extended format
As such, its quite a bit harder to profit by simply buying Pokemon booster packs in stores and reselling them
Theros had an enchantment theme (which could have been more prominent and powerful, but thats a different article) and it also had the Heroic keyword, which triggered when you cast a spell targeting a creature
Biotransference doing the organic-to-machine conversion is the flavor bonus on top