the Night Mother

When the Night Mother enters the battlefield, put 1 Elixir Counter on up to two creatures your opponent controls or in their graveyard.
When the Night Mother dies, place all cards from your opponents battlefield, hand, graveyard, and deck or in exile withe elixir counters on them onto your side of the field as the new owner
you do not own the card give them back to your opponent at the end of the game