An artifact that's a copy of either has a mana value of 0
Said plane became known as the Phyrexian Empire, known for its hordes of bio-mechanical undead warriors, demons, and monstrosities (Think an even more grimdark Dark Mechanicus/Necon hybrid with necromancy thrown in, and you'll have a general idea) He became a Cyborg-Necromancer-Scientist-Warlord, tried to take over Dominaria no less than three times, conquered other planes with his endless zombie cyborg demon army, and kept doing extremely evil things until he was killed by Urza and an alliance of planeswalkers
The anime, the Pokmon Generations animated miniseries, and even Japan-exclusive Pokmon Center merchandise lines would pair N with Reshiram, leaving the Pokmon Adventures manga series as the only major piece of media besides Black Version to show N with Zekrom
Its Shiny rare rarity drives most of the premium over the set's regular cards
Any advice is greatly appreciated
For example, suppose Junk Jet is attached to Infesting Radroach, a 2/2 creature