Let $T: {\mathbb R}^3\rightarrow {\mathbb R}^2$ be the linear transformation that first projects points onto the $yz$-plane and then reflects around the line $y=-z$. Find the standard matrix $A$ for $T$.

$A=$ $\left[\Rule{0pt}{2.4em}{0pt}\right.$$\left]\Rule{0pt}{2.4em}{0pt}\right.$.