
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
In the Cartesian coordinate system $xOy$, the line $C_{1}$: $y=- \sqrt {3}x$, and the parametric equation of the curve $C_{2}$ is $\begin{cases}x=- \sqrt{3}+\cos \phi \\ y=-2+\sin \phi\end{cases}$ (where $\phi$ is the parameter), with the origin as the pole and the positive half-axis of $x$ as the polar axis, a polar coordinate system is established.  
(Ⅰ) Find the polar equation of $C_{1}$ and the ordinary equation of $C_{2}$;  
(Ⅱ) Rotate $C_{1}$ clockwise around the origin by $\dfrac {\pi}{3}$ to get the line $C_{3}$, $C_{3}$ intersects $C_{2}$ at points $A$ and $B$, find $|AB|$.

Present the answer in LaTex format: \boxed{Your answer}
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