Maelstrom Colossus

Cascade was built to reward density: the more expensive the spell carrying it, the deeper into the library the free hit can reach. Eight mana is about as far as that logic stretches on a single card, which makes this Golem a stress test for the mechanic more than a puzzle to solve. Nearly everything in a deck costs less than eight, so the cascade almost always connects, and it connects with the widest possible range of nonland spells eligible to be revealed. What you get is a 7/7 body plus the option to cast for free the first nonland card the flip turns up, whatever that happens to be. Because cascade only triggers on the cast, the value is front-loaded into getting the Colossus onto the stack; a copy that resolves off a recursion or a reanimation effect brings a plain 7/7 and nothing else. Where narrow cascade payoffs like Bloodbraid Elf turned the mechanic into an aggressive tempo tool by pinning the reveal to a tight curve, this pushes in the opposite direction, treating cascade as a top-end reward rather than a two-for-one on turn four. The reveal is still a lottery (the mechanic never promised the best card, only a cheaper one), but with the ceiling raised this high the range of what can drop is enormous. It is cascade scaled up until the free spell stops being a bonus and becomes the reason to cast the creature at all.