a card with the word 'dark' in the name without any connection to
![Darkness :darkness](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/darkness18x18.png)
? XD
i'd re-word 'The creature's atk + def = X' to 'X = target's attack + HP'
The upgrade is a huge improvement: 1 less casting cost, 1 less cost to use, and 2 more healing.
I think that this'd mean that either the table is UP or the altar is OP, but it could be that they are both just a bit unbalanced.
this is not OP with any
![Gravity :gravity](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/gravity18x18.png)
card,
as GP would allow almost the same amount of bonus HP,
but also protects from the full final blow.
Just saying before some1 mentions it.
EDIT: I think it is fine if this triggers all death effects. The healing from sacrificing skeletons isn't much.