Morphotropic phase boundary (MPB) have aroused wide interests due to the exotic properties exhibited by the compositions around MPB [Tb1−x Dy x Co2, PRL 104, 197201 (2010); Tb1−x Dy x Fe2, PRL 111, 017203 (2013)]. By combining the two MPB compositions Tb0.3Dy0.7Co2 and Tb0.3Dy0.7Fe2, we designed a pseudo-binary system Tb0.3Dy0.7(Co1−x Fe x )2. The phase diagram is determined from the temperature spectra of magnetic susceptibility and magnetization. A Griffiths-like phase appears above the Curie temperature and gradually vanishes as the Fe content increases to x = 0.8. Magnetic hysteresis and magnetoelastic behavior are also investigated. Compared with the Terfenol-D composition x = 1.0, x = 0.8 exhibits higher Curie temperature (707 K) and comparable magnetostriction (818 ppm), which may be used in the sensors or transducers at high temperature.