My favorite combination with Koskun Falls is King Macar, the Gold-Cursed
While merfolk doesnt go as wide as, say, elves, having a critical defensive measure against removal at any cost is great, especially if youre going to lose a creature anyway
But soon, youll find how much fun it is to lay traps for your friends, bidding early to convince them that you didnt plant a skull at the top of your stack, then sitting back and waiting for them to flip it over
A 3/3 flyer in Mono-White for three mana is not something you'll normally have as an option
Players will undoubtedly test this out in Blink decks soon, and it may well earn a permanent spot there, but for now its an honorable mention at best