Your search for "Porphyry Nodes 28" revealed the following:
Porphyry Nodes (TSR) from Time Spiral Remastered, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Alan Pollack Card Text:At the beginning of your upkeep, destroy the creature with the least power. It can't be regenerated. If two or...
Porphyry Nodes (PLC) from Planar Chaos, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Alan Pollack Card Text:At the beginning of your upkeep, destroy the creature with the least power. It can't be regenerated. If two or more...
Porphyry Nodes (Foil) (PLC) from Planar Chaos, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Alan Pollack Card Text:At the beginning of your upkeep, destroy the creature with the least power. It can't be regenerated. If two or...