I'm going to be lazy and just post an idea I mentioned in Discord
Poison Bolt
3 :death | 1 :death
Spell
Gives 1 poison counter to the opponent plus 1 per 7 :death you have after playing this card.
Would give at most 14 poison (13 unupped). Weaker than deadly poison with less than 20 :death, so should be fine
Culling
10 :death | 8 :death
Spell
Sets the HP of all creatures with 7 or less HP to 0, without killing them.
Can target immaterial and burrowed creatures.
Consumes all remaining :death
not happy about this, but may as well post it.
i'll post an idea i had during the discussion
expunge
12 :death | 10 :death , remove remaining :death
deal double the damage of the number of poison counters to your opponent, reset opp poison counter to 0.
good as an execute card, better if poison is a supporting damage rather than the sole damage source unless the opp is low enough.
no name yet
10 :death/ 10 :death
0|10 / 0|20
enters play with 1 poison counter. Pay 25% of your current :death, rounded down, gain +1|+1 per paid quanta. When this creature attacks, return to 0|(10/20) and gain one more poison counter.