Edgar Markov
Oracle Text
Eminence — Whenever you cast another Vampire spell, if Edgar Markov is in the command zone or on the battlefield, create a 1/1 black Vampire creature token.
First strike, haste
Whenever Edgar Markov attacks, put a +1/+1 counter on each Vampire you control.
Card Rulings
8/25/2017 Edgar Markov’s last ability puts a +1/+1 counter on each Vampire you control, including itself and Vampires you control that aren’t attacking.
8/25/2017 Three eminence abilities are triggered abilities. That creature must be on the battlefield or in the command zone as the trigger event occurs and also as the triggered ability resolves. If the creature is in an appropriate zone as the trigger event occurs but leaves that zone, the ability won’t do anything as it resolves.
8/25/2017 Notably, if your commander is on the battlefield and its eminence ability triggers, but it’s put into the command zone before that ability resolves, that ability won’t do anything as it resolves. This is because an object that changes zones is considered a new object.
Arahbo: command zone passive gives one attacking cat +3/+3, which isn't terrible. If he is on the battlefield things are going to get out of hand any 3/3 attacking cat is going to turn into a 12/12 with trample not factoring in any of the deck's equipment theme. Honestly I think he might be best as a support card with the new Mirri as the commander. She could hit the 21 commander damage very quickly with his abilities, and green has creature tutors.
The Ur-Dragon: command zone passive helps with high cost dragons, not bad at all. Provided you can ever get him to the battlefield his other ability is a dragon only version of Kaalia with card advantage, which is awesome.