Great Grey Wolf, Sif

When enters the battlefield, it gets {x} +1/+1
counters on it.
{t} Put two +1/+1 counters on Great Grey Wolf,
Sif.
If Great Grey Wolf, Sif has four or more +1/+1 counters on it, it has Hexproof. If Great Grey
Wolf, Sif has six or more +1/+1 counters on it,
it has Doublestrike. If Great Grey Wolf, Sif has
eight or more +1/+1 counters on it, it has
Trample.