These cards were already limited in number, but to give one an error only increases its value
Alternatively, in Modern, I would put this in a prison deck in which my opponent was not able to attack with their creatures even if they had them
To condense the card as much as possible: if you target exactly one opponent or a permanent an opponent controls with an instant or sorcery, and nothing else, Zevlor copies it for each opponent you have
Unknown to him, the coin Edgar used was rigged, making Sabin the inevitable winner, and the Coin of Fate artwork subtly reveals this twist in the armors reflection, forming one of the sets strongest easter eggs
Soulburner's deck, the Salamangreat archetype, is a perfect example of this phenomenon
You could ask: Are you going to attack me this turn? Do you have a counterspell in your hand? Are you able to win the game this turn? If I were to ask you if you concede the game, would your answer to that question be the same as the answer to this question? Spark Fiend is hilarious because its not entirely clear what the card does, why it does it, or how it does it