So I'm just gonna list a number of cards I was wrong about and I want everyone to leave a comment with their own.
Legends of Runterra is a sufficiently complicated game to get your calls right 100 percent of the time

I thought this card was total trash boy was I wrong.
8 spell mana isn't that hard to hit in a ramp list.
If you run at least ten - 8 plus cards it will cycle or draw 2 usually.
and it let's you hit enlightened at burst speed so in the right deck it's practically a combat trick

We'll broaden this out to veteran investigator as well
Logic would dictate that playing a card to draw your opponent cards puts you behind on advantage
But it turns out in specific lists this can be used as an advantage
Shrooms is the popular meme way right now, but I think that it also has real potential in deep.
After all, once you hit deep and have nautiuls you can just empty your hand and your opponent can't

This one's cheating because he got a sneaky buff in the last patch
But this is a legit card now.
Pure value on cards like zed, or elusives, or anything that spawns 2 bodies
So let me know what cards you got wrong down in the comments.