Clovix Mallay, The Shadow

Whenever Clovix Mallay, The Shadow deals
combat damage to a player, that player reveals
their hand and discards a creature card. Return
that creature card from that player's graveyard
to the battlefield under your control. It must
attack each turn if able and is a Vampire in
addition to its other types.
Sacrifice another Vampire: Exile the top card
of your library. You may play it this turn.