I mean, I guess if "casual constructed" is a format you care about, every card is probably good.
I guess Day's Undoing is good in Modern Faeries (every spell in the deck other than Bitterblossom and Thoughtseize is a Flash card or an instant)
I mean that's not even slightly true. There's a difference between a card that has a clear purpose, is a powerful build-around and/or is efficiently costed for what it does but has no chance of doing anything in a tournament setting (Doubling Season is like the poster child for that type of card) and a card that does nothing and has no purpose except to piss you off by existing like Blessed Incarnation or "Random Fatty X that is worse than 3513513 other random fatties".
That being said, I want to open PWs and Languishes in my booster packs - but I can at least appreciate that cards like Conjuring and Remedy exist.