Read from the World of Warcraft client build files.
How Helheim Hound's Visor Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Helheim Hound's Visor suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Similar Items
The 4 items nearest to Helheim Hound's Visor (item level 13) in item level among Armor > Plate, Head slot, from item level 22 to 23.
Helheim Hound's Visor is part of the transmog set Funerary Plate of the Chosen Dead (Warrior, Paladin and Death Knight only), which the Appearances collection lists in 3 versions. The other 16 pieces:
Blizzard numbers items as they are created, so the named items next to ID 249678 (249670 to 249683) were usually added in the same batch as Helheim Hound's Visor: the same quest line, zone, vendor or reward set.