Insanity Devils

Insanity Devils is a archetype of FIRE Fiend type monsters who revolve around summoning themselves when a specific condition is met with activated effects that are mandatory. These summoning conditions tend to activate when a card leaves the field or a specific phase is entered when a condition is met

Appearance
The archety[e is split up into 2 parts. The InSanity Devils and the Sanity Devils. The InSanity have the appearance of vaguely humanoid creatures who's main body is Black with multiple shades of red and orange higher up on their bodies (usually their heads). Their name partly gives away their appearance. This is best shown in InSanity Devil of Skeletal, Malformed, Lurking.

The support has 2 different design aesthetics. The first being humans who are mostly covered and by the same substance that the InSanity Devils are made of. The second one being Close up of heads who seemingly are expelling the same substance

The name of the monsters (both InSanity and Sanity) hint at a state of mind like InSanity Devil of Insane, Wailing, Feral which alludes to Insanity or phobia people have such as InSanity Devil of Giant, Framing, Capturing which alludes to Cameraphobia