The Darkin Blade

Equip {2}. As an additional cost to play me, pay five life.

Equipped creature gains +2/+2, Trample
and Lifelink.

The Darkin Blade gains X blood counters, where X
is the damage dealt. When the creature it is equipped to dies, flip this card.

Aatrox, the Worldender has +1/+1 for each counter on the Darkin Blade.