Borderland Wurm

When Borderland Wurm deals combat damage to a player, if you control no untapped lands, that player discards a card.
{b}{b}{b}: Borderland Wurm gains swampwalk until end of turn, activate this ability only any time you could cast a sorcery.
"In the marsh separating Bala Ged and Guul Draz lie only corpses and a few animals. Although the latter quickly turn into the former."