Let me clarify myself a doubt: the card text reads:
4
: Separate
Generate a daughter creature with all values decreased by 1
Turn 1: I play a 5|5 doll.
Turn 2: I use skill, now i got a 4|4 doll and a 5|5 doll.
Turn 3: I use both skills and now i got a 3|3 (generated from the 4|4) and a 4|4 (generated from the 5|5).
That's not how matrioska works...
The 5|5 should generate a 4|4 and lose it's ability.
Then the 4|4 should generate a 3|3 and lose it's ability.
And so on...
Other way to get the same effect is this:
I really think that the ability should be "5 Part: Nesting Doll is cloned with an exact copy and takes -1|-1."
Do that would allow fun and interesting strategies to the card.
But adding the single use of ability.
So, in the end:
"5
Part: Nesting Doll is cloned with a lobotomized copy and takes -1|-1. "
OR
"5
Part: Nesting Doll is cloned with an exact copy and loses its ability. The copy gets -1|-1." (this is closer to real behavior of matrioska)
I hope i was clear!
EDIT: I'm sorry, i read just now the card notes. I thought the ability was not meant to be used once!