
Eminence — Whenever you cast another Vampire spell, if Edgar is in the command zonecommand zoneThe area where your commander waits before you cast it, and where it may return instead of going to the graveyard, exile, your hand or library. or on the battlefield, create a 1/1 black Vampire creature token.
First strikeFirst strikeDeals combat damage before creatures without first strike., hastehasteCan attack and use tap abilities the turn it comes under your control.
Whenever Edgar attacks, put a +1/+1 counter on each Vampire you control.
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Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.