Name:Porphyry Nodes
ManaCost:W
Types:Enchantment
T:Mode$ Phase | Phase$ Upkeep | ValidPlayer$ You | TriggerZones$ Battlefield | Execute$ TrigChooseOneToDestroy | TriggerDescription$ 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.
SVar:TrigChooseOneToDestroy:AB$ ChooseCard | Cost$ 0 | Choices$ Creature.leastPower+withoutIndestructible | Mandatory$ True | SubAbility$ DBDestroy
SVar:DBDestroy:DB$ Destroy | Defined$ ChosenCard | NoRegen$ True
T:Mode$ Always | TriggerZones$ Battlefield | IsPresent$ Creature | PresentCompare$ EQ0 | Execute$ TrigSac | TriggerDescription$ When there are no creatures on the battlefield, sacrifice CARDNAME.
SVar:TrigSac:AB$Sacrifice | Cost$ 0 | Defined$ Self
SVar:NeedsToPlay:Creature.YouDontCtrl+leastPower
SVar:RemAIDeck:True
SVar:Picture:http://www.wizards.com/global/images/magic/general/porphyry_nodes.jpg
Oracle: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.\nWhen there are no creatures on the battlefield, sacrifice Porphyry Nodes.