almighty push and an empty deck

[tcvance]

Pain: Deva Path (n1619) uses Almighty push (j998) paying 5 chakra:

a. 5 ninja's on the battlefield become standby.
b. Move 5 cards from the top and bottom of the deck to my hand

However, what if I only have 6 cards left in my deck? Do I draw as many as possible up to 10? Or can I only use 3 chakra in this case because I only have 6 cards in my deck? Can you choose too not apply the drawing effect if you so choose and just make ninja standby?

thanks ahead of time!