Raziriel is a health sustain fighter that excels vs tank and is a not restricted to the jungle. The longer he fights the the more damage he inflicts, shredding enemies armor over and over again.
He would be a nice jungler with strong ganks to help and snowball his teamates as well as himself which is helped by the slows from Piercing Dice and initiation from Mad Rush, which is high risk-reward ability
BloodBath benefits from big number of enemies damage. Each basic ability has reduced effect against enemy minions but is not restricted for monsters, champions and bigger minions. For instance because Sawis Majoris applies its effect several times this means that Bloothbath will heal Raziriel normally vs champions and monsters but less vs small minions since the density of minions could become pretty big while monster density is very small. If he hits 3 waves of minions which would be avarage about 20 units he would heal almost from 0 to 100 while vs 1 wave which would be average of 7 minions would just keep his health up for longer to stay in lane.
Bloodhell euphoria synchronizes with Bloodbath which late game in teamfights will keep him alive standing at the center of the fight that if there are enemy champions standing in the area damaged by his ultimate. Since healing / sustain is his major power Raiziriel would be really hard to be taken down without Healing Reduction