stacks in one turn. For example: One spell played, gain
+1. Second spell played, gain other
+1 (Spell Damage +2 total) and etc. After turn is over this effect starts from begining again.
I've never participated in such a thing, but here's my submission:
It's pretty self-explanatory. A spell version of Pyros. The last card, I decided not to add directly to your hand, because it makes the game a bit too simple. You'd just play the cards on curve and win. This makes it a finisher (or a draw, if you don't have 16+ health), but you probably can't rely on it solely.