Cryptoplasm | Magic: The Gathering
Formats Cryptoplasm is Legal in
Official Oracle Text for Cryptoplasm
—Vy Covalt, Neurok agent
Official Rulings for Cryptoplasm
6/1/2011 : The copy effect lasts indefinitely. Often, it will last until it is overwritten by another copy effect (if it copies another creature on a future turn, perhaps.)
6/1/2011 : If the creature is an illegal target when the ability tries to resolve, it will be countered. Cryptoplasm won't become a copy of that creature; it remains whatever it was before.
6/1/2011 : If another creature becomes a copy of Cryptoplasm, it will become a copy of whatever Cryptoplasm is currently copying (if anything), plus it will have Cryptoplasm's triggered ability.