Great game this, I'm having a blast with the quest mode (well, once I figured out that the "quest length" had no effect and I only got my first quest after 25 wins or so).
I just got a great combo by combining
Doubling Season,
Mycoloth (Spawn 1 Saproling per +1 token) and
Gilder Bairn (For each token on creature, create another).
I'm currently waiting for the
Mycoloth to spawn 864 Saprolings, it has taken a few minutes so far. (The Mycoltoh has 432 +1 tokens, and would get 1296 next turn if I bother.)
It just finished in fact and I just cast
Muraganda Petroglyphs (+2 all tokens) so my army of 1000+ 3/3 Saprolings are ready to take down the last 4 hit points of my enemy.

I tried the Shandalar interface that's under development and that has some real potential. Although it felt a bit weird when I did the first quest of defending the town that just when I was victorious I had to do everything again. I know that's the default setting in forge but it didn't feel like it made sense in an RPG setting.

The AI needs some work though, it doesn't seem to handle the Flanking effect of the wolf pet too good since it insists on defending with creatures that have 1 health, but overall it is great fun playing against.