An-Naml: 12
"And insert your hand into..."
{And nine signs} is a new sentence (inceptual). The prepositional phrase within it relates to an omitted verb. The meaning is: "Go with nine signs {to Pharaoh}."
An example of this usage is the verse:
I called to the food, and a group among them said:
"We envy mankind the food."
It is also permissible that the meaning is: "Cast your staff, and insert your hand, [as part of] nine signs," meaning: among the total of nine signs and their count.
One might ask: "The signs were actually eleven: two of them being the hand and the staff, and the nine being the flood, the locusts, the lice, the frogs, the blood, the blotting out [of wealth], the drought in their wilderness, and the deficiency in their crops."
{But when Our signs came to them, visible, they said, "This is manifest magic."}