He called a small group of apprentices to help him in this work, naming them Illumineers
So, let's try a couple scenarios, organized by the popularity of themes on EDHREC, specifically skipping the ones that don't support my point of view: You're playing against an artifact and/or Treasure deck, and you cast a Ruinous UltimatumRuinous Ultimatum
Revavroom is a surprisingly strong fit for this deck
Unlimited cards print darker and more saturated
In fact, he achieved a rare feat: he collected a full set of thirteen warlocks, all of them descended from one of the first thirteen warlocks who made pacts with Asmodeus, the ruler of the Nine Hells
If this card on the field is destroyed by battle or card effect and sent to the GY: You can Special Summon 1 "Subterror" monster from your Deck in face-up or face-down Defense Position