Are there any xyz and link monsters that have good generic effects when sent to grave?

So I’m trying to do an update to my little brother’s Gravekeepers deck. It is the one and only deck he is willing and wants to play with. But it’s been a while since he’s played it so I’m just helping him modernize it with his play style. Which is have Gravekeeper Spirtualist on the board with necrovalley and have necrovalley cards to help restrict opponent plays and have spell and traps to send cards to the grave as much as possible with Eradicator epidemic virus and deck devastation virus. I’ve found some cards that can help achieve his win condition with dogmatika punishment and ultimate slayer. I got fusions and synchro monsters with good GY effects. But yeah if any suggestions will help to how to modernize a Gravekeepers will be appreciated too.