Wanna be involved in the attacking and stay back to block and kill
If the cost is and you sacrifice a creature with mana value 7, you still pay
There are so many incentives to flood the battlefield with cheap garbage and end the game before it ever really starts, and Punishing Fire provides a reasonable backstop against those strategies, which are often among the best in Modern
The list includes special-frame variants like extended-art, retro frame, borderless, and showcase, plus alternate-language printings for collectors who care about those things
The Borderless, Textured Foil variant provides the most worth for collectors, and with flip-walkers coming along so rarely in Magic, Tamiyo and her fellows are well worth holding onto
Impact Tremors cannot damage creatures or planeswalkers, but Goblin decks are adept at pushing enough damage so effects like this can finish off the opponent sooner than later