Veliora, Wandering Hag

At the beginning of your end step, you may pay
3 life. If you do, mill 3. Put a +1/+1 counter on Veliora, Wandering Hag for each creature card
milled this way.
{2}{b}{g}{t}: Return up to one creature card
from your graveyard to the battlefield, and one creature card from your graveyard to your hand.