Dr Victor Frankenstein

Harness the Storm - Whenever one or more creature cards are put into your graveyard from your library, you get {e}.

{t},{e}{e}{e}{e}{e}{e}: Exile any number of creatures from target player's graveyard. Create a legendary 0/0 black Zombie Monstrosity creature token named "The Monster" with all keyword abilities of cards exiled this way, then put X +1/+1 counters on it, where X is the number of creatures exiled this way.