Bleakrend, Fortress of Calth

This land shares the colors of Red and Black.
You must have a Mountain and a Swamp Basic
Land otherwise this land can't be put on the battlefield.

{t}: Add a {b}{r}{c} to your mana pool.
{t}: All Undead Creatures under your control have
Flanking until end of turn.
{b}{r}{t}: Select a Undead Creature from your graveyard, then put it on the battlefield tapped.