Malenia, Blade of Miquella

Lifelink
Malenia, Blade of Miquella's attack is equal to the total number of +1/+1 counters on every creature.
{r/w}{w/b}{b/r}, sacrifice Malenia, Blade of Miquella: search your deck for a card named Malenia, Goddess of Rot and put it onto the battlefield. Then shuffle your deck.