User blog comment:Telaruhn/Sprig, The Brambleborn/@comment-58.172.169.216-20120217055455/@comment-4773210-20120217155528

Thanks for the feedback! :)

I had considered allowing Sprig's passive to stack with Thornmail, but I thought it would make him too tanky, which isn't my intention. The shield he places on allies, however, DOES stack with Thornmail.

I'm still considering the mana cost on Terra Firma, but because there's so much to it, there really isn't much I can use on current champions to compare it with. He has an upkeep cost similar to Swain, but it's at flat rate rather than one that stacks upon itself. Don't forget Sprig can't move during his ultimate, which I feel mitigates the mana cost slightly. Much like Maokai's ultimate, enemies can simply move out of the area of effect (but with much less ease), so it requires well-thought placement during teamfights, whereas Swain can transform while moving in on the enemy with his other abilties.