Can someone explain the effect of Strike Ninja?

Question

i dont really understand why its so good

Answer 1

Since u can remove 2 dark monsters. It can manage the grave so bringing out dark armed dragon becomes easier. It also adds 2 the remove pile allowing swarms with return from the different dimension and escape from the dark dimension.

Answer 2

it is a very good way to manage your own graveyard in a dark deck allowing either return from the different dimension or dark armed dragon to be used (potentially as an OTK) ... hope this helps