Faceless Sentinel

Lurk {c} ({c}: Turn this card face down. While face down it is a 3/3 creature with no color and no creature type. Turn it face up at any time by discarding a card.)
When you turn this card face up, choose one:
- Place two +1/+1 counter on Faceless Sentinel.
- Faceless Sentinel gains Unblockable until the end of the turn.