There's an element of randomness here, and you might not come out ahead of the exchange, but it's like being dealt a pair of aces in poker: odds are definitely in your favor that you'll end up ahead
Its not an approach I often take, but when I do, I only get better and better at the art of not needing subtlety
If your opponent played three creatures while you only played one, a board wipe like Wrath of God would be card advantageous because youre spending two cards in this transaction: your creature and Wrath of God
Brainstorm Played across a variety of formats, Brainstorm reigns supreme as the gold standard for cantrips
Karn frequently goes one for one with a problem card but this is fine
Granted, it might be a hard time to want to play discard cards (with Madness being all the rage), but in terms of rate, this card is incredibly efficient and should likely be the starting point for any potential blue splash