Trample

At the beginning of your endstep, if at least one non-token creature entered the battlefield under your control this turn, put a momentum counter on Wildgrowth Engine. Otherwise, remove a momentum counter. Then, distribute a number of +1/+1 counters among number of creatures you control equal to number of momentum on Wildgrowth Engine. If Wildgrowth Engine has 8 or more momentum counters on it, sacrifice that many creatures.