execute store result score random itemcount run random value 1..4
execute if score random itemcount matches 1 if block ~9 ~ ~ #survivalplus:respawnable run summon marker ~9 ~ ~ {Tags:[special,shadow],CustomName:"Shadow"}
execute if score random itemcount matches 2 if block ~-9 ~ ~ #survivalplus:respawnable run summon marker ~-9 ~ ~ {Tags:[special,shadow],CustomName:"Something"}
execute if score random itemcount matches 3 if block ~ ~ ~9 #survivalplus:respawnable run summon marker ~ ~ ~9 {Tags:[special,shadow],CustomName:"Shadow"}
execute if score random itemcount matches 4 if block ~ ~ ~-9 #survivalplus:respawnable run summon marker ~ ~ ~-9 {Tags:[special,shadow],CustomName:"???"}