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We present a detailed gravitational lens model of the galaxy cluster RCS2J232727.6-020437. Due to cosmological dimming of cluster members and ICL, itshigh redshift ($z=0.6986$) makes it ideal for studying background galaxies.Using new ACS and WFC3/IR HST data, we identify 16 multiple images. FromMOSFIRE follow up, we identify a strong emission line in the spectrum of onemultiple image, likely confirming the redshift of that system to $z=2.083$.With a highly magnified ($\mu\gtrsim2$) source plane area of $\sim0.7$arcmin$^2$ at $z=7$, RCS2 J232727.6-020437 has a lensing efficiency comparableto the Hubble Frontier Fields clusters. We discover four highly magnified$z\sim7$ candidate Lyman-break galaxies behind the cluster, one of which may bemultiply-imaged. Correcting for magnification, we find that all four galaxiesare fainter than $0.5 L_{\star}$. One candidate is detected at ${>10\sigma}$ inboth Spitzer/IRAC [3.6] and [4.5] channels. A spectroscopic follow-up withMOSFIRE does not result in the detection of the Lyman-alpha emission line fromany of the four candidates. From the MOSFIRE spectra we place median upperlimits on the Lyman-alpha flux of $5-14 \times 10^{-19}\, \mathrm{erg \,\,s^{-1} cm^{-2}}$ ($5\sigma$).

RCS2 J232727.6-020437: An Efficient Cosmic Telescope at $z=0.6986$