You can activate the effect of “Spark Blaster” multiple times in the same Main Phase. You can activate the effect of “Spark Blaster” during the same turn you played it from your hand.
You can chain to “Spark Blaster” when its effect is used. After its effect is used 3 times, you cannot chain to the destruction of “Spark Blaster”.
If “Silent Swordsman LV7” is on the field when “Spark Blaster’s” effect is used for the third time, “Spark Blaster” is still destroyed normally.
If you chain to the effect of “Spark Blaster” with “Emergency Provisions” and send “Spark Blaster” to your Graveyard, because “Spark Blaster” is no longer on the field its effect disappears.