Indestructible and Artefact Mutation

[LizardKING]

Here is a situation I have to deal with playing Hulk Smash. My opponent puts in play a Darksteel Colossus :

Darksteel Colossus
Artifact Creature 11/11
Trample.
Darksteel Colossus is indestructible ('Destroy' effects and lethal damage don't destroy it.)
If Darksteel Colossus would be put into a graveyard from anywhere, reveal Darksteel Colossus and shuffle it into its owner's library instead.

End of my opponent's turn, I wish for artifact mutation and play it :

Artifact Mutation
Instant
Destroy target artifact. It can't be regenerated.
Put X 1/1 green Saproling creature tokens into play, where X is its converted mana cost.  
 
What is happening as the Colossus cannot be destroyed by the AM ? Can I put my 11 Saproling tokens into play, even if the resolution of the fisrt part of the spell cannot be achieved ?

Thanks for the answers.

[Jebus]

You can't destroy the DC, but the spell still tries to do as much as it can.

So, you still get 11 tokens.