Cinderslash Ravager

A 5/5 with vigilance that sweeps small creatures on the way down would be a reasonable six-drop; the trick is that it rarely costs six. Every permanent you control carrying an oil counter shaves a mana, so in a board state where those counters have piled up, this arrives well ahead of curve and lands as a body plus a board-wide point of damage. That front-loading is the entire design tension. The enters-the-battlefield ping is a flat 1 damage to each creature your opponents control, no scaling with counters, no more and no less regardless of how deep the reduction runs. Against a wide start of one-toughness attackers, that flat point clears the way while your own side (untouched, since the ability only hits opponents) develops uninterrupted. Discount and sweep were tuned to serve the same plan: a counter-heavy board makes the card cheap, and a cheap sweeper on curve punishes exactly the go-wide openings that race you. The restriction that keeps it honest is that all of the discount lives outside the card. Drawn into an empty board, it is a plain six-mana 5/5 with a single point of ping, slow and unremarkable. It self-enables nothing; it demands you build the ladder elsewhere first, then pays out for having climbed it.