What is the most creative power in JJK?

Motivated by a recent thread about Hakari's Idle Death Gamble, I and a comment that said that Hakari's power was the most creative in JJK, I wanted to open up this discussion: what is Gege's most creative work in terms of power?

I don't think it's Idle Death Gamble, although it's fairly creative and certainly up there with the more creative shit. In my opinion, it has to go to Reggie Star's Contractual Re-Creation.

Think about it for a second. Dude walks around with receipts and contracts in general so he can summon whatever was bought. Imagine you're duking out with this guy and he summons a fucking car, or a truck, or something of a big size to smash you in (And he can make the car move for a little bit, like a fucking shikigami, in JJK world, the element of surprise might be your downfall and he can capitalize on that summoning 1 or 2 stationary cars and then bam one that moves and hits you).

Hell, imagine if he gets his hands on some multi-billion dollar contracts done by countries, states and prefectures so the dude just fucking summons shit like trains, jets, entire cityblocks, metro stations, houses (I know he created a house, but I'm talking about those housing government-creating housing units that have a lot of them), tanks, water pipes, oil and gas pipelines, OIL AND GAS ITSELF (I'm talking millions of tons of it), millions of tons of TNT, NUKES, etc. Megumi was lucky Reggie Star was reincarnated and didn't have the time to go around collecting contracts from cities, states and countries, because he would be royally fucked, I'm pretty sure Megumi won't be lifting himself off of a metro station on top of him, imagine if he summons Shibuya on his ass?

Not to mention he can summon services too! Spa treatment mid-battle was crazy, for sure, but he could also have some receipt for something like surgery done to him right away, meals for stamina (Now I wonder if he could only summon the service of a meal or the food itself, I guess it will depend on the contract), he could summon services of bodyguards (How would that work, I'm uncertain, but it would be cool to see).