my first lv 12 ss card O_O

[jellal17]

 

You cannot normal/set or special summon this card, you can only summon this card by its own effect.You can banish 5 dark monster in your graveyard to special summon this card from your hand, When this card is special summoned destroy all card on the field this effect cannot be negated or chained to.Once per turn you can banish 1 card in your graveyard to target 1 card your opponent controls and destroy it.

[Greiga]

You cannot normal/set or special summon this card, you can only summon this card by its own effect.You can banish 5 dark monster in your graveyard to special summon this card from your hand, When this card is special summoned destroy all card on the field this effect cannot be negated or chained to.Once per turn you can banish 1 card in your graveyard to target 1 card your opponent controls and destroy it.

 

Cannot be Normal Summon/Set. Must be Special Summoned (from your hand) by banishing 5 DARK monsters from your Graveyard, and not by other ways. When this card is Special Summoned: Destroy all cards on the field. Cards and effects cannot be activated in response to this effect. Once per turn: You can banish 1 card in your graveyard and target 1 card your opponent controls; destroy it.

 

I feel like 5 DARK monsters is still too little for something that nukes the field and cannot be chained to. I would also make the second effect banish only monsters because banishing used spell and traps is too easy.

[Progenitor]

As worded now the nuke effect also applies to itself, like black rose.  If you want this to survive, say "all other cards".