Shinobu's Vow + Fastball?

[coarse egret]

Does Shinobu's Vow benefit from Fastball?
Or does Shinobu's have intrinsic Fastball for Skip Grandes?
like Young Ahmkara's have intrinsic Fastball for Tripmines.

[marble vortex]

it should benefit from fastball. DIM doesn't say it has intrinsic fastball like YAS or sunbracers