Most instances of either gating condition are on activated abilities (most of which don't cost mana and therefore need a limiting condition), neatly solving the issue I'm about to mention, but consider this example: We're playing Innistrad Crimson Vow draft
Balzer Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
I love the story of this card because he's so fearsome in the art, but what he does in the game is [run away]...This is a great example of combining the character [lore] with a fun card, Ryan Miller Kim adds that Rexs card also features Woody and Buzz glimmers in the background, protected by their fearsome Bodyguard
Seconds later, I realized I had my card
He stays in the deck as a win condition, but doesn't steal the spotlight from Saheeli (yet)
When you put My Crushing Masterstroke in motion, you might just win the game on the spot