Warping Wurm (MIR-287) - Mirage

Phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.)
At the beginning of your upkeep, Warping Wurm phases out unless you pay .
Whenever Warping Wurm phases in, put a +1/+1 counter on it.