Sarulf, Realm Eater is a rare Legendary Creature — Wolf card from Kaldheim (KHM), collector number 330. Current market price: $0.38 (foil $2.94), TCGplayer market prices via Scryfall.
Whenever a permanent an opponent controls is put into a graveyard from the battlefield, put a +1/+1 counter on Sarulf. At the beginning of your upkeep, if Sarulf has one or more +1/+1 counters on it, you may remove all of them. If you do, exile each other nonland permanent with mana value less than or equal to the number of counters removed this way.