Cheapest priced copy (The Brothers' War Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Phyrexian Rebirth 
Sorcery · Rare · Phyrexia: All Will Be One Commander · #86
Destroy all creatures, then create an X/X colorless Phyrexian Horror artifact creature token, where X is the number of creatures destroyed this way.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
7 printings · $0.49 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Brothers' War Commander | 74 | Rare | $0.49 | — |
| Commander 2016 | 73 | Rare | $0.49 | — |
| Commander 2018 | 70 | Rare | $0.49 | — |
| Commander 2019 | 68 | Rare | $0.49 | — |
| Mirrodin Besieged | 15 | Rare | $0.49 | $4.49 |
| March of the Machine Commander | 199 | Rare | $0.49 | — |
| Phyrexia: All Will Be One Commander | 86 | Rare | $0.49 | — |
2 rulings from Wizards of the Coast
- 1 June 2011Any triggered abilities that trigger because a creature was destroyed won't be put onto the stack until after Phyrexian Rebirth finishes resolving. This means the Horror creature token can be targeted by those abilities, if applicable.
- 1 July 2013If a creature regenerates or has indestructible, it won't be counted when determining the value of X.