The Skullspore Nexus

The cost reduction reads backwards from most ramp payoffs: instead of ramping into the eight-mana price, you build a board first and let the price collapse. Green already floods the table with oversized bodies, so the greatest-power clause tends to shave four, five, or six mana off the cast, and the payoff arrives at a discount rather than at the top of a mana curve. The death trigger is where the design grows teeth. Where most token-on-death effects hand you a fixed body or a 1/1, this one scales to the total power of everything that died at once, so a board wipe or a mass sacrifice doesn't empty your side of the field; it converts the pile into a single Fungus Dinosaur whose size equals what you lost. Sweepers aimed at your creatures feed the very engine they were cast to answer, which is a rare thing to build into a green top-end. Note the nontoken restriction: the trigger won't feed off the tokens it makes, the seam that keeps a sacrifice loop from spiraling into an infinite chain. Once it resolves, the power-doubling activation does double duty: it inflates the next Fungus Dinosaur's math on the death trigger, and it can push the greatest power on your board higher to discount your other spells that care about creature size. Three abilities, all reading off the same statistic, all pointing back at a board of large bodies.