Grave Engine

Equipped creature has +3/+3 and deathtouch
and is an artifact in addition to it's other types.
{3}{b}, Put a charge counter on Grave Engine.
Then return target creature from your graveyard
to the battlefield under your control with Grave
Engine attached to it. Activate this only when
there are no charge counters on Grave Engine
and only any time you could cast a sorcery.
Equip {6}