Thanks for the questions and comments guys.
OldTrees pretty much got it, you can't buff the attack of a Marionette (if given Blessing it would just +0/+3). Also their default attack without a Puppeteer is 0, and I've added that into the notes.
I was afraid this might have been OP, but the way you guys are making it seem, perhaps not.
But anyways, I was looking at the numbers, running a mono-darkness deck here is what you would get for the upped cards:
4
for Eclipse
+
5
for Puppeteer
=
9
yields 4 att
_____
+ 2
per marionette
11
yields 8 att
13
yields 12 att
15
yields 16 att
17
yields 20 att
19
yields 24 att
21 darkness yields 28 att
Not efficient enough for the amount of cards necessary to pull it off.
However running a Duo-Death-Life deck:
5
for Puppeteer
+
2
for
one Improved Blessing
=
7 quanta yields 5 att
_____
+2
per marionette
9 quanta yields 10 att
11 quanta yields 15 att
13 quanta yields 20 att
15 quanta yields 25 att
17 quanta yields 30 att
19 quanta yields 35 att
And that's just with 1 blessing. You throw in two or three, and this becomes very powerful, but requires a duo deck as well several cards to pull off.
Further thoughts?