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Plasma's effect takes any monster the opponent controls and turns it into an equip card

The utility of being able to use this as a (sorcery-speed) pump spell in addition to the fight mechanic was extremely valuable to those decks at the time, which were full of cards like Questing Beast, Lovestruck Beast, Gemrazer, Kazandu Mammoth and other beefy creatures that benefited heavily from fighting

It even has some decent graveyard hate attached to it as well

Market value: $260300 raw

Bear Umbra Grants totem armor and untaps all your lands when attacking

These cards are a lot worse than that, but I might run a set of paladins in a knights deck instead of my lowest-tier spot removal spells