Eminence — Whenever you cast another Vampire spell, if Edgar is in the command zone or on the battlefield, create a 1/1 black Vampire creature token.
First strike, haste
Whenever Edgar attacks, put a +1/+1 counter on each Vampire you control.
Flood the board with Vampires using Edgar's Eminence trigger from the command zone, anthem-boost the swarm, and crash in for lethal while his attack trigger pumps everyone. You curve out cheap Vampires turn after turn, generating free tokens, then close fast with go-wide aggression backed by sacrifice and drain effects.
Eminence works from the command zone, so you generate value even before Edgar hits the battlefield or after he dies
Extremely fast, explosive starts that can punish slow tables
Built-in anthem via the attack trigger snowballs board state quickly
Mardu colors give access to the best removal, tutors, and aristocrats payoffs
Heavily reliant on a wide board, so board wipes are devastating
Token-centric strategy folds to Cyclonic Rift, Wrath effects, and stax pieces
Can run out of gas if the aggression is stopped or stabilized against
Vulnerable to spot removal and graveyard hate on key recursion pieces