Blackwall of the Grey

All creatures able to block Blackwall of the
Grey must do so.
{w}: Absorb 2 (If a source would deal damage
to this creature, prevent 2 of that damage.)
{b}{b}: Blackwall of the Grey gains Vigilance, Menance and +1/-1 until the end
of turn. Activate only once per turn and only when you would cast a sorcery.