I thought it was quite different from UG. Can you please state how would you compare to it?
Both have the primary purpose of dealing a burst of 20 damage to the opponent.
UG: 1card + 6
+ 1 turn + 1
+ duo = 10
TB: 1 card + X
+ 1
+ 3 turns = X+5
UG = TB + Inferior Thunderstorm (note: actual thunderstorm card is UP)
Lets call the inferior thunderstorm worth 1
UG - Inferior Thunderstorm = TB
10 - 1 = X + 5
9 = X + 5
4 = X
However, you would love having it deal damage to creatures as well. You wanted to suggest a card that would act primarily as a burst of damage and secondarily as mass damaging creature control. I submit that Unstable Gas mechanically answers that suggestion perfectly.