Cool idea, but I think it is a little expensive for a death effect. You're using a card and 3
![Death :death](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/death18x18.png)
for that.
Virus achieve the same for 1 card, 1
![Death :death](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/death18x18.png)
and 1 turn (and also gives damage and poison)
I think you can lower the cost by 1.
Nice idea with the discard effect.