Can a cryptoplasm shapeshift back to its original form at will magic

[monto]

lets say my cryptoplasm is copying some 1/1 creature and it takes 1 damage i want to revert to its original form so that it can be 2/2, can I do that at will?

and if not, then how about at the beginning of upkeep, can I choose to have it go back to its original form then?

[Arix]

No. Once it's turned into a creature, the only way it can turn back into a Cryptoplasm is if there's another Cryptoplasm in play that isn't copying anything. And Even then you can only change back at the beginning of your upkeep.