[Darkwind]

I actually found this game on Newgrounds first (although which first recieved it I'm unsure of), but I'm fairly sure Sonny is pretty much everywhere now.

But this was fun until I got frustrated with drawing the exact wrong cards I needed to win the game while the enemy piled up card after card that I couldn't dispel or resist. I eventually gave up and left. The multiplayer option the creator is considering sounds like great fun though.