When an enemy unit dies, it goes to your void.
Shadowlands Feaster is a Unit.
How to Get Edit
Beat the eighth mission in Jekk's Bounty, "The Lair of the Beast".
This card can counter cards that go to the enemy Void, and come back, by putting them in your void. This counters cards with Revenge, and cards that come back over and over, such as Dawnwalker and Ephemeral Wisp.
It can also come in to surprise block a card your opponent wants in their void to put into your void instead.
Enemy Entomb effects will still trigger.
Units with Revenge will shuffle into your deck.