Cheapest priced copy (Time Spiral Remastered): $0.49 at Card Kingdom, near mint, their price list as of .
Porphyry Nodes 
Enchantment · Rare · Planar Chaos · #28
At the beginning of your upkeep, destroy the creature with the least power. It can't be regenerated. If two or more creatures are tied for least power, you choose one of them.
When there are no creatures on the battlefield, sacrifice this enchantment.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.49 to $7.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Planar Chaos | 28 | Rare | $0.79 | $7.99 |
| Time Spiral Remastered | 32 | Rare | $0.49 | $1.49Out of stock |
4 rulings from Wizards of the Coast
- 19 March 2021The first ability of Porphyry Nodes doesn't target. You can destroy a creature with shroud or protection from white.
- 19 March 2021If all creatures on the battlefield leave and immediately return (perhaps because Momentary Blink exiled and returned the only creature), the last ability of Porphyry Nodes triggers. You'll sacrifice it even though a creature's on the battlefield by the time the ability resolves.
- 19 March 2021If one of the creatures with the least power has indestructible, you must destroy one without indestructible. If all creatures with the least power have indestructible, you don't destroy any creature.
- 19 March 2021No player can take actions between the time you choose which creature to destroy and the time it's destroyed.