When Zenos turns into Shinryu, Transcendent Rival the alternate win condition reads, When the chosen player loses the game, you win the game. While somewhat reminiscent of cards like Ramses, Assassin Lord, Zenos asks you to jump a lot less hoops, and can be activated at instant speed during your opponent's turn if you kill your first friend
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One weakness is a less good mana base, losing cards like Farseek (Rakdos Keyrune is just not the same) and Kessig Wolf Run (or man lands) as well as worse life gain
You can also treat it as creature or planeswalker targeted removal with its mana and discard ability
Fact or Fiction became such a powerhouse that it became an anagram for Vintage - "EOTFOFYL" which stood for "End of Turn, Fact or Fiction, You Lose." It led to dominant new decks in Vintage (such as a mono-Blue build called "BBS" for Blue BS which led to Morphing) and was ultimately restricted
This is because Magic is an ever-changing game where new cards introduced into the environment make older cards more or less valuable