During your Main Phase: You can Special Summon this card and 1 Level 4 or lower Fiend-Type monster from your hand. You cannot Normal Summon/Set during the turn you activate this effect. You can only use this effect of "Umbral Horror Ghost" once per turn.
This card has more options with some set-up. Not an OP card but has some niche uses.
Good for a palabyrinth plays.
Summon lava golem then summon this and flare resonator synchro for armades.
Can also synchro stygian sergeants if we ever get the card. Field spam for Raviel.
Niche xyz potential.