Yidris, Maelstrom Wielder

Cascade was built for a single spell at a time: cast Bloodbraid Elf, flip one free hit off the top, move on. Bolting that keyword onto a combat trigger rewrites its economy. Once this connects, cascade attaches to every spell you cast from your hand this turn, so a hand full of expensive bombs becomes a hand full of free spells plus their cascades. The chain does not recurse, though, and the distinction matters: the trigger only touches spells cast from hand, while cascade casts its hits from exile, so the free spells underneath do not pick up cascade themselves. What you get is breadth, not infinite depth: every card you play that turn comes with one bundled freebie, and a long turn means a lot of freebies. The body is delivery and nothing else. A 5/4 with trample is a real clock that punches past chump blockers, but it carries no protection and no evasion beyond raw size, so survival leans on the four-color identity to supply the interaction. That four-color cost cuts both ways: black, green, red, and blue open cascade onto a deck of high-end spells, but they also demand a mana base that produces all four before the trigger can ever matter. Nothing happens until damage lands, and then everything happens at once. This is a payoff creature that pays nothing until the combat step it depends on resolves in your favor.