Cryptoplasm
Creature — Shapeshifter
At the beginning of your upkeep, you may have this creature become a copy of another target creature, except it has this ability.
"If left in the enemy's shape too long, it might be lost to them." —Vy Covalt, Neurok agent
Eric Deschamps
Mirrodin Besieged (MBS)
• #23Rulings
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.
(wotc • 2011-06-01)
If the creature is an illegal target when the ability tries to resolve, it won’t resolve. Cryptoplasm won’t become a copy of that creature; it remains whatever it was before.
(wotc • 2011-06-01)
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.)
(wotc • 2011-06-01)
You choose the target for the triggered ability when the ability is put onto the stack. You choose whether or not Cryptoplasm becomes a copy of that creature when the ability resolves.
(wotc • 2011-06-01)
Rulings
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.
(wotc • 2011-06-01)
If the creature is an illegal target when the ability tries to resolve, it won’t resolve. Cryptoplasm won’t become a copy of that creature; it remains whatever it was before.
(wotc • 2011-06-01)
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.)
(wotc • 2011-06-01)
You choose the target for the triggered ability when the ability is put onto the stack. You choose whether or not Cryptoplasm becomes a copy of that creature when the ability resolves.
(wotc • 2011-06-01)