Primal Cocoon | Magic: The Gathering
Formats Primal Cocoon is Legal in
Official Oracle Text for Primal Cocoon
At the beginning of your upkeep, put a +1/+1 counter on enchanted creature.
When enchanted creature attacks or blocks, sacrifice Primal Cocoon.
Official Rulings for Primal Cocoon
8/15/2010 : The counters are put on the creature, not on Primal Cocoon. They'll stay on the creature even after Primal Cocoon is sacrificed or otherwise stops enchanting that creature.