Ultros, Obnoxious Octopus

The rare payoff that reads not the spell you cast but the check you write to cast it. Most spellslinger commanders count triggers: cast a noncreature spell, get a token, draw a card, add an instance to a running tally. This one measures the mana actually spent on a single spell, and the threshold structure changes what you want to cast rather than how often. Four mana spent taps and stuns something across the table; eight mana spent buries eight +1/+1 counters onto a body that starts as a fragile 2/1. Cheap cantrips and one-mana removal, the usual glue of a blue tempo shell, do nothing here. The card wants overloaded spells, expensive board wipes, and large X spells where the X drives the payment up. The wording is precise about this: it tracks the amount of mana spent, so overload and kicker surcharges and additional costs all push toward the thresholds, while cost reduction works against you (spend less mana and you fall short of the trigger). Freezing rather than killing is what keeps the four-mana mode from being flat removal: you are not clearing the blocker, you are locking it through an untap step and buying exactly one window. The eight-mana mode is the finisher the whole thing is built around, a lethal-out-of-nowhere clause bolted onto a creature cheap enough to redeploy and keep casting into.