Burrowing Duskwhisker

Burrowing {w}{r} (You may cast it for its burrowing cost, when you do it becomes unblockable except by other creatures that
are burrowed. It has hexproof, but its power
and toughness are cut in half.)
When Burrowing Duskwhisker deals combat damage to a player you may create a
2/2 mouse token with burrowing.