I'm actually kind of partial to this one, from Throne of Eldraine : This card sees relatively little play in Standard, somewhat outshone by Glass Casket
He's got a very fun effect, too, which essentially resurrects the creatures he kills as thralls that are 'bound' to him -- when the Krovikan Vampire dies, so do the resurrected minions
I saw a tweet the other day where someone posted an image of their energy deck, but only showing the non MH3 cards
It's good stuff
Flying, trample, haste Whenever this creature deals combat damage to a player, you create a Treasure token for each artifact that player controls
Combined with life-gain or life-loss synergies, he can either stabilize or act as a game-ending threat