Affinity for Equipment (This spell costs {1} less to cast for each Equipment you control.)

Flying, lifelink, menace, trample

During your turn, if an opponent lost life this turn, you may return target Equipment from your graveyard to the battlefield under your control.

Equipments you control cost {X} less to equip, where X is the amount of life you gained this turn.

When Aatrox, World Ender dies, return it to the battlefield transformed under its owner's control.

Whenever equipped creature dies, exile it

Equipped creature gets +2/-1

Then if there are four or more creature cards exiled with The Heart of the Blood Moon, transform it.

Equip - pay 3 life