Cheapest priced copy (World Championship Decks 2000): $0.49 at Card Kingdom, near mint, their price list as of .
Phyrexian Processor 
Artifact · Rare · World Championship Decks 1999 · #kb306sb
As this artifact enters, pay any amount of life.
{4}, {T}: Create an X/X black Phyrexian Minion creature token, where X is the life paid as this artifact entered.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
12 printings · $0.49 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Brothers' War Retro Artifacts | 39 | Mythic | $0.99 | $1.99 |
| The Brothers' War Retro Artifacts | 102 | Mythic | $0.99 | $0.99 |
| The Brothers' War Retro Artifacts | 102z | Mythic | — | — |
| Duel Decks: Phyrexia vs. the Coalition | 29 | Rare | $0.99 | — |
| Secret Lair Drop | 2445 | Rare | $0.79 | — |
| Urza's Saga | 306 | Rare | $2.99 | — |
| From the Vault: Lore | 12 | Mythic | — | $0.99 |
| World Championship Decks 2000 | jf306b | Rare | $0.49 | — |
| World Championship Decks 2000 | jk306 | Rare | $0.49 | — |
| World Championship Decks 2000 | jk306sb | Rare | $0.49 | — |
| World Championship Decks 2000 | nl306sb | Rare | $0.49 | — |
| World Championship Decks 1999 | kb306sb | Rare | $0.49 | — |
One ruling from Wizards of the Coast
- 4 October 2004You can pay 0 life if you want, but it's not useful most of the time.