Growing Threat

Growing Threat is a 100-card Commander precon from March of the Machine Commander, released April 21, 2023. It is led by Brimaz, Blight of Oreskos, an Orzhov commander.

Brimaz, Blight of Oreskos

Whenever you cast a Phyrexian creature or artifact creature spell, incubate X, where X is that spell's mana value. (Create an Incubator token with X +1/+1 counters on it and ": Transform this token." It transforms into a 0/0 Phyrexian artifact creature.)
At the beginning of each end step, if a Phyrexian died under your control this turn, proliferate.

The list runs 38 lands and 32 creatures, and its nonland cards average 4.10 mana. At today's TCGplayer prices the whole deck's cards come to about $89.50, and the most valuable is Filigree Vector at $11.23.