Karazikar, the Eye Tyrant, Marisi, Breaker of the Coil, Kardur, Doomscourge, Baeloth Barrityl, Entertainer and Firkraag, Cunning Instigator all bring out the worst in opposing creatures
Artifact Color tag templates(None) Deathbringer Regent Flying When this creature enters, if you cast it from your hand and there are five or more other creatures on the battlefield, destroy all other creatures
Its also generally thought that Japanese print runs are smaller than English for comparable sets
Riptide Gearhulk sees the most play in Constructed 1v1 and Commander, based on the fact that its a form of blinkable removal, and it even fits as a control finisher
Also note that if you wanted to build a Mono-Red Devil deck you could do so although it's not needed