Mark of Cain

{b/r}{b/r}: equip
Can only be equipped to a creature with toughness of 5 or more

Equipped creature has haste, reach, deathtouch, invincibility and this creature cannot be killed. Attacks every one of your attack phases if able

If Mark of Cain is destroyed or sacrificed, destroy all creatures. You may exile one other card the opponent controls then discard a card.