I'm not quite sure if this has been done before (I have never seen it). It occurred to me today, so I thought I'd share.
The trainer seems to be down for me right now, so I'll post the one I made in my elements account. This means not all cards are upgraded, only the ones I happened to have from other things.
I made it today, and have not used it a lot yet, but I think it is a neat idea, and it could be further developed. I played 7 games, with 6 wins and one lose in sliver arena. One special spin.
Hover over cards for details, click for permalink
58o 58o 58o 58o 58o 58o 58o 58o 58o 58p 58p 58p 58u 58u 58u 593 593 596 596 596 596 596 596 778 77j 7gq 7gs 7hi 7hi 7hi 8pp
Some things to note:
Iridium warden has that ability that everyone (or at least I) always forgets about: it attacks the target as well as delay it. This works while under SoP's effects, so not only do you get to stall with them while they grow, but as soon as they start having attack power, you can start wiping off all enemy creatures quite quickly.
Antlion's burrow ability means that once it's burrowed, SoP's attack effects are doubled.
Some thoughts on how to improve it:
Perhaps an enchant artifact to protect SoP, or towers. Perhaps switch that purify for something else, balance water and earth quanta better.