@Ajit: thanks! it was indeed ^^
@headshrinker: yes, it's another possibility but I thought that it could be difficult for the game mechanics to transform a perm into a creature. This is more like creature is dead but rises again from the death.
Also I thought another possibility by using this as an spell, enchanting your graveyard to generate a copy of the next creature instead of skelletons.
There are many possibilities indeed, but I chose that ^^
If you want I could make a poll. But I don't know if it's too late and changes are not available while in the Armory (as people voted the card as it is). Maybe a curator could solve that doubt