Porphyry Nodes

Enchantment, W (1)
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 Porphyry Nodes.¹
Illus. Alan Pollack

Gatherer Card Rulings [Nov 2009]

• 7/15/2006: This card's ability is not targeted, so even untargetable creatures or those with Protection can be chosen.
• 2/1/2007: If the creature with the least power is indestructible, the ability does nothing.
• 2/1/2007: If there are multiple creatures with tied for least power and some but not all of them are indestructible, the indestructible one can't be chosen.
• 2/1/2007: This is the timeshifted version of Drop of Honey.

Format Legality	Legal in Vintage, Legacy, Extended, MTGO Classic Banned in Standard
Printings (1/9)	Planar Chaos (Rare)