Talk:Jet Black Grim Reaper, Gaito/@comment-43897300-20190929051057/@comment-26942477-20191001143157

See the timing of both effect:

This card: "When this card attacks" so this card eff only active while its attack and mill if the monster is destroyed.

while Negulbatz: "When a monster or item on your opponent's field destroy" is activate upon a destruction of monster/item in order to mill

They only share wording for the mill part, the rest of effect was completly different