Cheapest listings I could find on TCGPlayer for damaged-but-tournament-legal power nine cards:
- Ancestral Recall: $2,700
- Black Lotus: $30,000
- Mox Emerald: $2,150
- Mox Jet: $2,200
- Mox Pearl: $1,800
- Mox Ruby: $2,400
- Mox Sapphire: $2,700
- Timetwister: $3,680
- Time Walk: $2,170
- Total: $49,800
Let's make the math easy by saying you can get the whole P9 for $50k including shipping. Now of course you're going to want four copies of Oracle of the Alpha, so in case you draw all of them, you'll need four copies of the P9. So that's $200k. But you're not thinking like a real Magic player yet. Any creature with a good ETB ability, you're going to want to blink it. Let's add four copies of Momentary Blink. That means you can potentially proc Oracle an additional eight times per game, so now we're up to $600k. Oh wait, I forgot Soulherder existed. That's, uh....
The ultimate flex, if your name is Post Malone or something, would be to build a 60-card Oracle of the Alpha/Battle of Wits deck. Let's say that in the worst case you might draw through half of it before you get the combo set up. That means you'll need to refill with 170 cards, or 19 copies of the Power 9. This deck will cost you $950,000. That's ignoring the fact that you will pretty quickly start affecting the market by trying to build it....