Trample
Scourge of Skola Vale enters the battlefield with two +1/+1 counters on it.
{T}, Sacrifice another creature: Put a number of +1/+1 counters on Scourge of Skola Vale equal to the sacrificed creature's toughness.
Use the toughness of the sacrificed creature as it last existed on the battlefield to determine how many +1/+1 counters to put on Scourge of Skola Vale.