This is very similiar card to Precision Strike. But 1 resource cheaper, and you need to kill a minion (with basic attack or event) In the scenario with many low health minions this is super value and a way to stay in hero form longer. It can be very good in his own. But now we can make a archetype with cheap cards that heal (this card, Precision Strike, Moment of Triumph).

Taking all above I can give Suppresing Fire a grade: A- (A-C) - worth including in almost all aggresion decks. Two or even a three copies.