> This is also why Snecko Eye (the relic that gives +2 draw every turn and randomizes card cost) is arguably the best boss relic. Even if you only get to play one 3 cost card, it's more likely to be the best card in your deck.

I can't agree with this. Snecko Eye is very strong, but playing a 3-cost card will cripple you. It's strong because you draw a lot of cheap cards -- the lesson of Snecko Eye is that playing several cards is better than playing one card, even if the cards you got to play were chosen randomly.

That's definitely part of it, but you'll still get the occasional hand full of 3-costs, and all of them not being completely awful is important.