Molten Monstrosity

The math is the whole pitch: eight mana of stated cost that a big enough board pays off almost entirely, because the discount scales off the single largest power you already control. Put a 5/5 on the table and this collapses to three mana; drop a 7-power beater and it costs a single red. The design leans on a specific tension in cost reduction: unlike affinity or convoke, which count many small things, this cares only about your one biggest creature, so it rewards the exact board state a stompy red deck already wants to build. That makes it a payoff rather than an enabler. The trample is load-bearing, since a deck built to trigger a cheap cast is a deck full of creatures that want to punch through chump blockers, and a fresh 5/5 with trample keeps the pressure honest when the ground stalls or the board thins out. The failure case is equally clean and equally by design: with nothing bigger than a token on board, it is a 5/5 for eight, which is the price you pay for the potential of casting it nearly free. It is a curve-topper that only tops the curve when you have earned it, and the number it asks for (your greatest power) is the same number a beatdown deck is trying to maximize anyway.