Wild-Breaker Harness

You control equipped creature.
Equipped creature is a Mount in addition to its other
types and has saddle X, where X is its power.
At the beginning of your end step, if equipped creature
isn't saddled, unattach Wild-Breaker Harness.
{3}, {t}: Attach Wild-Breaker Harness to target
non-Human creature. Activate only as a sorcery.