2011-01-22
If Hinterland Scourge is attacking, the defending player must assign at least one blocker to it during the declare blockers step if that player controls any creatures that could block it.
2016-07-13
For more information on double-faced cards, see the Shadows over Innistrad mechanics article (http://magic.wizards.com/en/articles/archive/feature/shadows-over-innistrad-mechanics).