Keeper of the Dusty Crevice

Keeper of the Dusty Crevice enters the battlefield with X dust counters. If you control Dusty Crevice you may activate it's ability for {x} less to activate where {x} is the numbers of dust counters on Keeper of the Dusty Crevice.
If you control Dusty Crevice, Keeper of the Dusty Crevice gains "{3}{u}{b}:Keeper of the Dusty Crevice gets +2/+2 for each dust counter on it and gains menace and trample until the end of turn ."