the necrovalley' errata appeared in the same pack of goyo guardian' errata, so i think they wanted to balance the +++ power of necrovalley and the --- power of the new goyo errata.
I see. That's interesting decision they make. I imagine the KONAMI I know would choose making a new card that 'treated as necrovalley' instead of doing errata when buffing gravekeeper.
I can see KONAMI doing errata when nerfing, tho. Goyo guardian kind of deserve it since the old one is too good as a generic lv 6 synchro.
Official card game
