If you attack with your “Mystic Tomato” and it is destroyed as a result of battle, you may attack with the monster Special Summoned by “Mystic Tomato” before entering Main Phase 2.
If your opponent controls your “Mystic Tomato” and it is destroyed as a result of battle, you get the effect of “Mystic Tomato” NOT your opponent.
Since the Special Summoning occurs during the Damage Step, “Torrential Tribute”, etc. cannot be used.