Well... both type and attribute has to match. I thought about using it to summon that lvl 4 dark dragon with 2400 atk, but there is not much option for lvl 3 dark dragons. So it Blue or Red eyes still might be more consistent. And lvl 5 monsters ar not so good either. Maybe it could work in a dark warrior deck for lvl 5s. Or maybe there is a lvl 5 Dark zombie with 2400 atk... maybe that might work
Well I found a useful thing: It is possible to special summon Space-Time Police whit this. Btw And Freed cannot be special summoned, and Wattail is a lvl 6. I like when people who know the least have the bigest mouth. And you bother lvl 3 to 4 cause the lvl 4 dragon with 2400 atk can only be special summoned. I found some other cards that let special summon lvl 4 monsters, so the idea is not dead.