i like the idea of a decaying card beyond just something that enters the game poisoned. balancing it to be worthwhile may be tricky, though.
I haven't touched this in a while so let's see if my memory still serves correctly.
4
![Time :time](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/time18x18.png)
+ 2
![Gravity :gravity](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/gravity18x18.png)
per turn + 1 card = 4
![Time :time](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/time18x18.png)
+ 3 cards ~= 8
![Underworld :underworld](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/underworld18x18.png)
+ 1 card for 8|4, which at first seems a bit weak, but Clockwork Golem does full damage the first turn for no upkeep, so there is always that.
1
![Time :time](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/time18x18.png)
+ 1
![Gravity :gravity](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/gravity18x18.png)
per turn + 1 card + upgrade = 1
![Time :time](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/time18x18.png)
+ 2 cards +upgrade ~= 3
![Underworld :underworld](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/underworld18x18.png)
+ 1 card + upgrade for 4|4 which is also fine.
The hard part about balancing something like this is fractal or mitosis, but that is also the reason I tried to price it around frog, minor phoenix, and BL.
I can definitely see it being used. It's a compliment to GotP, creates a good
![Time :time](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/time18x18.png)
+
![Gravity :gravity](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/gravity18x18.png)
duo, opens up another good usage of Eternity and RT, and also has synergy with mitosis and fractal.