This plus fractal...
6 orcs -> +15 to each orc -> 21 ATK each... 126 point OTK.
Cost: 9
+ 40
So basically a 2 card 49
OTK... would require these 2 cards and at least 3 other free hand slots... eg you could hold up to 3 other cards at the same time...
Having extra orcs in hand will not hurt the combo either, so you only have to worry about drawing too many fractals.
I believe there may be lower cost OTK combos, but the fact that this only takes 2 cards is pretty significant. I don't know of any OTKs that need fewer than 4 unique cards.
So building a deck around this combo may be quite doable.
Even without the OTK combo, getting even 3 orcs out in the same turn is significant threat since that is the equivalent of 3 dragons at a fraction of the price.
I leave decisions on the OPness of the orc spam combo to the community. But this card certainly doesn't seem to be UP...