Rootwire Amalgam

Prototype gives this Golem two entirely different resumes on one card, and the sacrifice ability is built to reward whichever one you're playing toward. Cast for its printed cost, it lands as a 5/5, and the activated ability then reads as a triple-your-power blowout: sacrifice a five-power body to mint a 15/15 with haste at sorcery speed. Cast small under the prototype line, it comes down as a 2/3, a cheaper early body that holds the sacrifice trick in reserve until the mana is there to fire it. The math is the whole tension: three times power means the token scales with how much you've committed, so the card asks whether you want a cheap creature that eventually detonates or an already-large threat you can convert straight into something enormous. Sorcery-speed timing denies the instant-speed ambush that would make a 15/15-on-demand too easy, but the haste rider means the token isn't a turn behind: it swings the moment it appears. Prototype's design conceit is that the same rules text carries two mana costs and two bodies, and this one leans into that harder than most, pairing a flexible front end with a payoff that scales off whichever body you paid for.