Verena, the Sovereign of Decay

At the beginning of your upkeep, you may return target creature card from your graveyard to the battlefield under your control. If you do, you lose
life equal to its converted mana cost.
Whenever Verena deals combat damage to a
player, that player discards a card and you may
return a creature card from your graveyard to
your hand.
In the realm of decay, life is but an offering to the eternal cycle.